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Document And Entity Information - USD ($) $ in Billions	12 Months Ended
Document And Entity Information - USD ($) $ in Billions	Mar. 31, 2012	May 01, 2012	Sep. 30, 2011
Document And Entity Information [Abstract]
Entity Registrant Name	COMMVAULT SYSTEMS INC
Entity Central Index Key	0001169561
Document Type	10-K
Document Period End Date	Mar. 31, 2012
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1.5
Entity Common Stock, Shares Outstanding		44,663,905

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 297,088	$ 217,170
Short-term investments	3,146	1,150
Trade accounts receivable, less allowance for doubtful accounts of $97 and $106 at March 31, 2012 and 2011, respectively	67,793	73,891
Prepaid expenses and other current assets	12,606	8,476
Deferred tax assets, net	14,717	12,043
Total current assets	395,350	312,730
Deferred tax assets, net	23,861	21,736
Property and equipment, net	8,184	6,400
Other assets	5,293	1,633
Total assets	432,688	342,499
Current Liabilities:
Accounts payable	1,847	1,658
Accrued liabilities	45,888	33,475
Deferred revenue	125,314	98,217
Total current liabilities	173,049	133,350
Deferred revenue, less current portion	22,059	14,695
Other liabilities	7,596	6,324
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, $0.01 par value: 50,000 shares authorized, no shares issued and outstanding at March 31, 2012 and 2011.
Common stock, $0.01 par value, 250,000 shares authorized, 44,594 shares and 43,965 shares issued and outstanding at March 31, 2012 and 2011, respectively	446	440
Additional paid-in capital	320,438	271,622
Accumulated deficit	(91,139)	(84,239)
Accumulated other comprehensive income	239	307
Total stockholders' equity	229,984	188,130
Total liabilities and stockholders' equity	$ 432,688	$ 342,499

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011
Consolidated Balance Sheets [Abstract]
Allowance for doubtful trade accounts receivable	$ 97	$ 106
Stockholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	44,594,000	43,965,000
Common stock, shares outstanding	44,594,000	43,965,000

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Revenues:
Software	$ 201,800	$ 149,798	$ 134,500
Services	204,839	164,978	136,525
Total revenues	406,639	314,776	271,025
Cost of revenues:
Software	2,747	2,369	3,017
Services	50,660	38,646	32,628
Total cost of revenues	53,407	41,015	35,645
Gross margin	353,232	273,761	235,380
Operating expenses:
Sales and marketing	219,025	163,054	136,773
Research and development	39,936	36,954	33,421
General and administrative	40,619	34,207	29,823
Depreciation and amortization	4,353	3,775	3,514
Income from operations	49,299	35,771	31,849
Interest expense	(57)	(106)	(106)
Interest income	750	650	384
Income before income taxes	49,992	36,315	32,127
Income tax expense	18,052	15,311	13,722
Net income	$ 31,940	$ 21,004	$ 18,405
Net income per common share:
Basic	$ 0.72	$ 0.49	$ 0.44
Diluted	$ 0.68	$ 0.45	$ 0.41
Weighted average common shares outstanding:
Basic	44,089	43,283	42,133
Diluted	47,201	46,301	45,022

Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning balance at Mar. 31, 2009	$ 416	$ 210,462	$ (99,397)	$ (192)	$ 111,289
Beginning balance, shares at Mar. 31, 2009	41,593
Stock-based compensation		14,912			14,912
Tax benefits relating to share-based payments		3,378			3,378
Exercise of common stock options and vesting of restricted stock units	$ 15	10,269			10,284
Exercise of common stock options and vesting of restricted stock units, shares	1,462
Repurchase of common stock		(9)	(39)		(48)
Repurchase of common stock, shares	(2)
Comprehensive income:
Net income			18,405		18,405
Foreign currency translation adjustment				80	80
Total comprehensive income					18,485
Ending Balance at Mar. 31, 2010	$ 431	239,012	(81,031)	(112)	158,300
Ending Balance, shares at Mar. 31, 2010	43,053
Stock-based compensation		15,623			15,623
Tax benefits relating to share-based payments		7,084			7,084
Exercise of common stock options and vesting of restricted stock units	$ 25	17,133			17,158
Exercise of common stock options and vesting of restricted stock units, shares	2,469
Repurchase of common stock	$ (16)	(7,230)	(24,212)		(31,458)
Repurchase of common stock, shares	(1,557)
Comprehensive income:
Net income			21,004		21,004
Foreign currency translation adjustment				419	419
Total comprehensive income					21,423
Ending Balance at Mar. 31, 2011	$ 440	271,622	(84,239)	307	$ 188,130
Ending Balance, shares at Mar. 31, 2011	43,965				43,965
Stock-based compensation		21,426			$ 21,426
Tax benefits relating to share-based payments		16,072			16,072
Exercise of common stock options and vesting of restricted stock units	$ 19	18,104			18,123
Exercise of common stock options and vesting of restricted stock units, shares	1,952
Repurchase of common stock	$ (13)	(6,786)	(38,840)		(45,639)
Repurchase of common stock, shares	(1,323)
Comprehensive income:
Net income			31,940		31,940
Foreign currency translation adjustment				(68)	(68)
Total comprehensive income					31,872
Ending Balance at Mar. 31, 2012	$ 446	$ 320,438	$ (91,139)	$ 239	$ 229,984
Ending Balance, shares at Mar. 31, 2012	44,594				44,594

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Cash flows from operating activities
Net income	$ 31,940	$ 21,004	$ 18,405
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,484	3,906	3,630
Noncash stock-based compensation	21,426	15,623	14,912
Excess tax benefits from stock-based compensation	(16,009)	(7,044)	(3,395)
Deferred income taxes	(4,993)	7,798	6,471
Changes in operating assets and liabilities:
Trade accounts receivable	5,419	(14,206)	(11,801)
Prepaid expenses and other current assets	(4,198)	(3,756)	(786)
Other assets	(3,720)	(314)	(97)
Accounts payable	204	(261)	27
Accrued liabilities	29,038	13,469	8,757
Deferred revenue	35,599	17,892	19,967
Other liabilities	810	(1,701)	1,157
Net cash provided by operating activities	100,000	52,410	57,247
Cash flows from investing activities
Purchase of short-term investments	(3,146)	(2,751)	(5,293)
Proceeds from maturity of short-term investments	1,150	6,644	250
Purchase of property and equipment	(5,796)	(3,865)	(3,370)
Net cash (used in) provided by investing activities	(7,792)	28	(8,413)
Cash flows from financing activities
Repurchase of common stock	(45,639)	(31,506)
Proceeds from the exercise of stock options	18,123	17,158	10,284
Excess tax benefits from stock-based compensation	16,009	7,044	3,395
Net cash provided by (used in) financing activities	(11,507)	(7,304)	13,679
Effects of exchange rate - changes in cash	(783)	2,518	1,800
Net increase in cash and cash equivalents	79,918	47,652	64,313
Cash and cash equivalents at beginning of year	217,170	169,518	105,205
Cash and cash equivalents at end of year	297,088	217,170	169,518
Supplemental disclosures of cash flow information
Interest paid	57	106	106
Income taxes paid	$ 9,680	$ 3,894	$ 4,130

Nature Of Business

12 Months Ended

Mar. 31, 2012

Nature Of Business [Abstract]

Nature Of Business

1.	Nature of Business

CommVault Systems, Inc. and its subsidiaries ("CommVault" or the "Company") is a leading provider of data and information management software applications and related services. The Company develops, markets and sells a suite of software applications and services, primarily in North America, Europe, Australia and Asia, that provides its customers with high-performance data protection; data migration and archiving; snapshot management and replication of data; integrated source and target deduplication; e-discovery and compliance solutions; protection, recovery and discovery of data in virtual server environments; enterprise-wide search capabilities; and management and operational reports, remote services and troubleshooting tools. The Company's unified suite of data and information management software applications, which is sold under the Simpana brand, shares an underlying architecture that has been developed to minimize the cost and complexity of managing data on globally distributed and networked storage infrastructures. The Company also provides its customers with a broad range of professional and customer support services.

Summary Of Significant Accounting Policies

12 Months Ended

Mar. 31, 2012

Summary Of Significant Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

2.	Summary of Significant Accounting Policies

Basis of Presentation

The consolidated financial statements include the accounts of the Company. All intercompany transactions and balances have been eliminated.

Use of Estimates

The preparation of financial statements and related disclosures in conformity with U.S. GAAP requires management to make judgments and estimates that affect the amounts reported in the Company's consolidated financial statements and the accompanying notes. The Company bases its estimates and judgments on historical experience and on various other assumptions that it believes are reasonable under the circumstances. The amounts of assets and liabilities reported in the Company's balance sheets and the amounts of revenues and expenses reported for each of its periods presented are affected by estimates and assumptions, which are used for, but not limited to, the accounting for revenue recognition, allowance for doubtful accounts, income taxes and related reserves, stock-based compensation and accounting for research and development costs. Actual results could differ from those estimates.

Revenue Recognition

The Company derives revenues from two primary sources: software licenses and services. Services include customer support, consulting, assessment and design services, installation services and training. A typical sales arrangement includes both of these sources.

For sales arrangements involving multiple elements, the Company recognizes revenue using the residual method. Under the residual method, the Company allocates and defers revenue for the undelivered elements based on fair value and recognizes the difference between the total arrangement fee and the amount deferred for the undelivered elements as revenue. The determination of fair value of the undelivered elements in multiple-element arrangements is based on the price charged when such elements are sold separately, which is commonly referred to as vendor-specific objective-evidence, or VSOE.

The Company's software licenses typically provide for a perpetual right to use the Company's software and are sold on a per-copy basis, on a capacity basis or as site licenses. Software licenses sold on a capacity basis provide the customer with unlimited licenses of specified software products based on a defined level of terabytes of data under management. Site licenses give the customer the additional right to deploy the software on a limited basis during a specified term. The Company recognizes software revenue through direct sales channels upon receipt of a purchase order or other persuasive evidence and when all other basic revenue recognition criteria are met as described below. The Company recognizes software revenue through all indirect sales channels on a sell-through model. A sell-through model requires that the Company recognize revenue when the basic revenue recognition criteria are met as described below and these channels complete the sale of the Company's software products to the end-user. Revenue from software licenses sold through an original equipment manufacturer partner is recognized upon the receipt of a royalty report or purchase order from that original equipment manufacturer partner.

Services revenue includes revenue from customer support and other professional services. Customer support includes software updates on a when-and-if-available basis, telephone support, integrated web-based support and bug fixes or patches. Customer support revenue is recognized ratably over the term of the customer support agreement, which is typically one year. To determine the price for the customer support element when sold separately, the Company primarily uses historical renewal rates. Historical renewal rates are supported by performing an analysis in which the Company segregates its customer support renewal contracts into different classes based on specific criteria including, but not limited to, the dollar amount of the software purchased, the level of customer support being provided and the distribution channel. As a result of this analysis, the Company has concluded that it has established VSOE for the different classes of customer support when the support is sold as part of a multiple-element sales arrangement. The Company's determination of fair value for customer support has not changed for the periods presented.

The Company's other professional services include consulting, assessment and design services, installation services and training. Other professional services provided by the Company are not mandatory and can also be performed by the customer or a third-party. In addition to a signed purchase order, the Company's consulting, assessment and design services and installation services are, in some cases, evidenced by a Statement of Work, which defines the specific scope of such services to be performed when sold and performed on a stand-alone basis or included in multiple-element sales arrangements. Revenues from consulting, assessment and design services and installation services are based upon a daily or weekly rate and are recognized when the services are completed. Training includes courses taught by the Company's instructors or third-party contractors either at one of the Company's facilities or at the customer's site. Training fees are recognized after the training course has been provided. Based on the Company's analysis of such other professional services transactions sold on a stand-alone basis, the Company has concluded it has established VSOE for such other professional services when sold in connection with a multiple-element sales arrangement. The Company generally performs its other professional services within 90 days of entering into an agreement. The Company's determination of fair value for other professional services has not changed for the periods presented.

The Company has analyzed all of the undelivered elements included in its multiple-element sales arrangements and determined that VSOE of fair value exists to allocate revenues to services. Accordingly, assuming all basic revenue recognition criteria are met, software revenue is recognized upon delivery of the software license using the residual method.

The Company considers the four basic revenue recognition criteria for each of the elements as follows:

•

Persuasive evidence of an arrangement with the customer exists. The Company's customary practice is to require a purchase order and, in some cases, a written contract signed by both the customer and the Company, or other persuasive evidence that an arrangement exists prior to recognizing revenue related to an arrangement.

•

Delivery or performance has occurred. The Company's software applications are either physically or electronically delivered to customers with standard transfer terms such as FOB shipping point. Software and/or software license keys for add-on orders or software updates are typically delivered in an electronic format. If products that are essential to the functionality of the delivered software in an arrangement have not been delivered, the Company does not consider delivery to have occurred. Services revenue is recognized when the services are completed, except for customer support, which is recognized ratably over the term of the customer support agreement, which is typically one year.

•

Vendor's fee is fixed or determinable. The fee customers pay for software applications, customer support and other professional services is negotiated at the outset of a sales arrangement. The fees are therefore considered to be fixed or determinable at the inception of the arrangement.

•

Collection is probable. Probability of collection is assessed on a customer-by-customer basis. Each new customer undergoes a credit review process to evaluate its financial position and ability to pay. If the Company determines from the outset of an arrangement that collection is not probable based upon the review process, revenue is recognized at the earlier of when cash is collected or when sufficient credit becomes available, assuming all of the other basic revenue recognition criteria are met.

The Company's sales arrangements generally do not include acceptance clauses. However, if an arrangement does include an acceptance clause, revenue for such an arrangement is deferred and recognized upon acceptance. Acceptance occurs upon the earliest of receipt of a written customer acceptance, waiver of customer acceptance or expiration of the acceptance period.

Net Income per Common Share

Basic net income per common share is computed by dividing net income by the weighted average number of common shares during the period. Diluted net income per share is computed using the weighted average number of common shares and, if dilutive, potential common shares outstanding during the period. Potential common shares consist of the incremental common shares issuable upon the exercise of stock options and the vesting of restricted stock units. The dilutive effect of such potential common shares is reflected in diluted earnings per share by application of the treasury stock method.

The following table sets forth the computation of basic and diluted net income per common share:


	Year Ended March 31,
	2012		2011		2010
Net income	$	31,940	$	21,004	$	18,405

Basic net income per common share:
Basic weighted average shares outstanding		44,089		43,283		42,133

Basic net income per common share	$	0.72	$	0.49	$	0.44

Diluted net income per common share:
Basic weighted average shares outstanding		44,089		43,283		42,133
Dilutive effect of stock options and restricted stock units		3,112		3,018		2,889

Diluted weighted average shares outstanding		47,201		46,301		45,022

Diluted net income per common share	$	0.68	$	0.45	$	0.41

The following table summarizes the potential outstanding common stock equivalents of the Company at the end of each period, which have been excluded from the computation of diluted net income per common share, as its effect is anti-dilutive.

Year Ended March 31,

2012

2011

2010

Stock options and restricted stock units

626

1,002

728

Software Development Costs

Research and development expenditures are charged to operations as incurred. Based on the Company's software development process, technological feasibility is established upon completion of a working model, which also requires certification and extensive testing. Costs incurred by the Company between completion of the working model and the point at which the product is ready for general release are immaterial.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable consist of amounts due to the Company from normal business activities. The Company maintains an allowance for estimated losses resulting from the inability of its customers to make required payments. The Company estimates uncollectible amounts based upon historical bad debts, evaluation of current customer receivable balances, age of customer receivable balances, the customer's financial condition and current economic trends.

Accounting for Income Taxes

As part of the process of preparing financial statements, the Company is required to estimate its income taxes in each of the jurisdictions in which it operates. This process involves estimating actual current tax exposure, including assessing the risks associated with tax audits, and assessing temporary differences resulting from different treatment of items for tax and accounting purposes. These differences result in deferred tax assets and liabilities. As of March 31, 2012, the Company had net deferred tax assets of approximately $38,578, which were primarily related to federal and state research tax credit carryforwards, stock-based compensation and foreign net operating loss carryforwards. The Company assesses the likelihood that its deferred tax assets will be recovered from future taxable income, and to the extent that the Company believes recovery is not likely, the Company establishes a valuation allowance. As of March 31, 2012, the Company maintains a valuation allowance against its deferred tax assets totaling $1,420 primarily related to the uncertainty of the Company's ability to utilize certain state research tax credits before they expire. The Company based its valuation allowance on its estimates of taxable income by legal entity and the period over which its state research tax credits will be recoverable.

The calculation of the Company's tax liabilities involves dealing with uncertainties in the application of complex tax regulations in each of its tax jurisdictions. The number of years with open tax audits varies depending on the tax jurisdiction. A number of years may lapse before a particular matter is audited and finally resolved. The Company applies the guidance issued to address the accounting for uncertain tax positions. This guidance clarifies the accounting for income taxes, by prescribing a minimum recognition threshold a tax position is required to meet before being recognized in the financial statements as well as provides guidance on derecognition, measurement, classification, interest and penalties, accounting in interim periods, disclosure and transition.

As of March 31, 2012, the Company had unrecognized tax benefits of $4,699, all of which, if recognized, would favorably affect the effective tax rate. In addition, the Company had accrued interest and penalties of $784 related to the unrecognized tax benefits. Interest and penalties, if any, related to unrecognized tax benefits are recorded in income tax expense. Components of the reserve are classified as either current or long-term in the Consolidated Balance Sheet based on when the Company expects each of the items to be settled.

Cash and Cash Equivalents

The Company considers all highly liquid investments purchased with maturities of three months or less at the date of purchase to be cash equivalents. As of March 31, 2012, the Company's cash and cash equivalents balance consisted primarily of money market funds.

Concentration of Credit Risk

The Company grants credit to customers in a wide variety of industries worldwide and generally does not require collateral. Credit losses relating to these customers have been minimal.

Sales through the Company's reseller and original equipment manufacturer agreements with Dell totaled approximately 22%, 23% and 24% of total revenues for the years ended March 31, 2012, 2011 and 2010, respectively. Dell accounted for 25% of accounts receivable as of both March 31, 2012 and 2011. Sales through the Company's distribution agreement with Arrow Enterprise Computing Solutions, Inc. ("Arrow") totaled approximately 26%, 25% and 24% of total revenues for the years ended March 31, 2012, 2011 and 2010, respectively. Arrow accounted for approximately 30% and 32% of total accounts receivable as of March 31, 2012 and 2011, respectively.

Fair Value of Financial Instruments

The carrying amounts of the Company's cash and cash equivalents, accounts receivable and accounts payable approximate their fair values due to the short-term maturity of these instruments. As of March 31, 2012, the Company's short-term investments balance consisted of certificates of deposit.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for such asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value should maximize the use of observable inputs and minimize the use of unobservable inputs. To measure fair value, the Company uses the following fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable:

Level 1 — Quoted prices in active markets for identical assets or liabilities.

Level 2 — Inputs other than Level 1 that are observable for the asset or liability, either directly or indirectly, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data by correlation or other means.

Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The following table summarizes the composition of the Company's financial assets measured at fair value on a recurring basis at March 31, 2012 and March 31, 2011:


	March 31,
	2012		2011
Cash and cash equivalents:
Money market funds	$	232,037	$	182,911

All of the Company's financial instruments in the table above were classified and measured as Level 1 instruments.

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization. The Company provides for depreciation on a straight-line basis over the estimated useful lives of the assets. Computer and related equipment is generally depreciated over eighteen months to three years and furniture and fixtures are generally depreciated over three to five years. Leasehold improvements are amortized over the shorter of the useful life of the improvement or the term of the related lease. Expenditures for routine maintenance and repairs are charged against operations. Major replacements, improvements and additions are capitalized.

Asset Retirement Obligation

A liability for the fair value of an asset retirement obligation and corresponding increase to the carrying value of the related leasehold improvements are recorded at the time leasehold improvements are acquired. As of March 31, 2012, the Company maintains office space in the United Kingdom for which the lease agreement requires that the Company return the office space to its original condition upon vacating the premises. Accordingly, the balance of the asset retirement obligation as of March 31, 2012 is $552.

Long-Lived Assets

The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be fully recoverable. To determine the recoverability of its long-lived assets, the Company evaluates the estimated future undiscounted cash flows that are directly associated with, and that are expected to arise as a direct result of, the use and eventual disposition of the long-lived asset. If the estimated future undiscounted cash flows demonstrate that recoverability is not probable, an impairment loss would be recognized. An impairment loss would be calculated based on the excess carrying amount of the long-lived asset over the long-lived asset's fair value. The fair value is determined based on valuation techniques such as a comparison to fair values of similar assets. There were no impairment charges recognized during the years ended March 31, 2012, 2011 and 2010.

Deferred Revenue

Deferred revenues represent amounts collected from, or invoiced to, customers in excess of revenues recognized. This results primarily from the billing of annual customer support agreements, as well as billings for other professional services fees that have not yet been performed by the Company and billings for license fees that are deferred due to one of the revenue recognition criteria not being met. The value of deferred revenues will increase or decrease based on the timing of invoices and recognition of software revenue. The Company expenses internal direct and incremental costs related to contract acquisition and origination as incurred.

Deferred revenue consists of the following:


	March 31,
	2012		2011
Current:
Deferred software revenue	$	3,764	$	237
Deferred services revenue		121,550		97,980

	$	125,314	$	98,217

Non-current:
Deferred services revenue	$	22,059	$	14,695

Accounting for Stock-Based Compensation

The Company utilizes the Black-Scholes pricing model to determine the fair value of non-qualified stock options on the dates of grant. Restricted stock units are measured based on the fair market value of the underlying stock on the date of grant. The Company recognizes stock-based compensation using the straight-line method for all stock awards.

The Company classifies benefits of tax deductions in excess of the compensation cost recognized (excess tax benefits) as a financing item cash inflow with a corresponding operating cash outflow. For the years ended March 31, 2012, 2011 and 2010, the Company includes $16,009, $7,044, and $3,395, respectively, as a financing cash inflow.

Share Repurchases

The Company considers all shares repurchased as cancelled shares restored to the status of authorized but unissued shares on the trade date. The aggregate purchase price of the shares of the Company's common stock repurchased is reflected as a reduction to Stockholders' Equity. The Company accounts for shares repurchased as an adjustment to common stock (at par value) with the excess repurchase price allocated between Additional Paid-in Capital and Accumulated Deficit. As a result of the Company's stock repurchases in the fiscal years ended March 31, 2012 and 2011, the Company reduced common stock and additional paid-in capital by $6,799 and $7,246, respectively, and accumulated deficit by $38,840 and $24,212, respectively.

Sales Tax

The Company records revenue net of sales tax.

Advertising Costs

The Company expenses advertising costs as incurred. Advertising expenses were $4,582, $3,819, and $2,121 for the years ended March 31, 2012, 2011 and 2010, respectively.

Shipping and Handling Costs

Shipping and handling costs are included in cost of revenues for all periods presented.

Foreign Currency Translation

The functional currencies of the Company's foreign operations are deemed to be the local country's currency. Assets and liabilities of the Company's international subsidiaries are translated at their respective period-end exchange rates, and revenues and expenses are translated at average currency exchange rates for the period. The resulting balance sheet translation adjustments are included in Other Comprehensive Income (Loss) and are reflected as a separate component of Stockholders' Equity.

Foreign currency transaction gains and losses are recorded in "General and administrative expenses" in the Consolidated Statements of Income. The Company recognized net foreign currency transaction losses of $232 in the year ending March 31, 2012, net foreign currency transaction losses of $623 in the year ending March 31, 2011, and net foreign currency transaction losses of $647 in the year ending March 31, 2010. The net foreign currency transaction gains and losses recorded in "General and administrative expenses" include settlement gains and losses on forward contracts disclosed below.

To date, the Company has selectively hedged its exposure to foreign currency transaction gains and losses on the balance sheet through the use of forward contracts, which were not designated as hedging instruments. The duration of forward contracts utilized for hedging the Company's balance sheet exposure is generally one to three months. As of March 31, 2012 and March 31, 2011, the Company did not have any forward contracts outstanding. The Company recorded net realized gains of $37 and net realized losses of $48 in general and administrative expenses related to the settlement of a forward exchange contracts in the years ending March 31, 2012 and 2011, respectively. In the future, the Company may enter into additional foreign currency-based hedging contracts to reduce its exposure to significant fluctuations in currency exchange rates on the balance sheet.

Comprehensive Income

Comprehensive income is defined to include all changes in equity, except those resulting from investments by stockholders and distribution to stockholders. Comprehensive income for the fiscal years ending March 31, 2012, 2011 and 2010 is as follows:


	Year Ended March 31,
	2012			2011		2010
Net income	$	31,940		$	21,004	$	18,405
Foreign currency translation adjustment		(68	)		419		80

Total comprehensive income	$	31,872		$	21,423	$	18,485

Impact of Recently Issued Accounting Standards

In June 2011, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update No. 2011-05, Comprehensive Income (Topic 220) — Presentation of Comprehensive Income ("ASU 2011-05"), which requires companies to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. This update eliminates the option to present the components of other comprehensive income as part of the statement of equity. In December 2011, the FASB issued Accounting Standards Update No. 2011-12, Comprehensive Income (Topic 220): Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income ("ASU 2011-12"), to defer the effective date of the specific requirement to present items that are reclassified out of accumulated other comprehensive income to net income alongside their respective components of net income and other comprehensive income. All other provisions of this update are effective for the Company in the first quarter of fiscal 2013. The Company does not believe the adoption of this new guidance will have a significant impact on its consolidated financial statements.

Property And Equipment

12 Months Ended

Mar. 31, 2012

Property And Equipment [Abstract]

Property And Equipment

3.	Property and Equipment

Property and equipment consist of the following:


	March 31,
	2012			2011
Computer equipment	$	11,267		$	10,609
Other machinery and equipment		9,525			8,167
Leasehold improvements		6,631			4,375
Purchased software		1,818			1,623
Furniture and fixtures		2,037			1,684

		31,278			26,458
Less: Accumulated depreciation and amortization		(23,094	)		(20,058	)

	$	8,184		$	6,400

The Company recorded depreciation and amortization expense of $4,484, $3,906, and $3,630 for the years ended March 31, 2012, 2011 and 2010, respectively.

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

+ References + Details

Accrued Liabilities

12 Months Ended

Mar. 31, 2012

Accrued Liabilities [Abstract]

Accrued Liabilities

4.	Accrued Liabilities

Accrued liabilities consist of the following:


	March 31,
	2012		2011
Compensation and related payroll taxes	$	28,391	$	19,204
Other		17,497		14,271

	$	45,888	$	33,475

Credit Facility

12 Months Ended

Mar. 31, 2012

Credit Facility [Abstract]

Credit Facility

5.	Credit Facility

In July 2009, the Company entered into an amended and restated credit facility in which the Company could borrow up to $30,000 over a three year period. Borrowings under the amended and restated credit facility were available to repurchase the Company's common stock under its share repurchase program and to provide for working capital and general corporate purposes. On October 12, 2011, the Company terminated its amended and restated credit facility. As a result, the Company can no longer borrow the $30,000 that was available under the amended and restated credit facility.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Commitments And Contingencies

12 Months Ended

Mar. 31, 2012

Commitments And Contingencies [Abstract]

Commitments And Contingencies

6.	Commitments and Contingencies

Leases

The Company leases various office and warehouse facilities under non-cancelable leases, which expire on various dates through October 2016. Future minimum lease payments under all operating leases at March 31, 2012 are as follows:


Year Ending March 31:
2013	$	8,637
2014		7,139
2015		6,433
2016		2,804
2017		196

	$	25,209

Rent expenses were $8,498, $6,778, and $5,628 for the years ended March 31, 2012, 2011 and 2010, respectively.

Rent expense is calculated by amortizing total rental payments (net of any rental abatements, allowances and other rental concessions), on a straight-line basis, over the lease term. Accordingly, rent expense charged to operations differs from rent paid resulting in the Company recording deferred rent.

Letter of Credit

As of March 31, 2012, the Company had an outstanding letter of credit for $144 issued in connection with a revenue transaction. This letter of credit will remain outstanding until September 30, 2012.

Purchase Commitments

The Company, in the normal course of business, enters into various purchase commitments for goods or services. Total non-cancellable purchase commitments as of March 31, 2012 are approximately $5,181 for fiscal 2013, $1,054 for fiscal 2014, $136 for fiscal 2015, $84 for fiscal 2016 and $42 for fiscal 2017, totaling $6,497 for all periods through fiscal 2017. These purchase commitments primarily result from contracts for the acquisition of IT infrastructure, marketing and software development services.

The Company has certain software royalty commitments associated with the shipment and licensing of certain products. Royalty expense is generally based on a fixed cost per unit shipped or a fixed fee for unlimited units shipped over a designated period. Royalty expense, included in cost of software revenues, was $1,611 in fiscal 2012, $1,295 in fiscal 2011 and $1,290 in fiscal 2010.

Indemnifications

The Company offers a 90-day limited product warranty for its software.

Legal Proceedings

In the normal course of its business, the Company may be involved in various claims, negotiations and legal actions. As of March 31, 2012, the Company is not aware of any asserted or unasserted claims, negotiations and legal actions that are both considered reasonably possible of occurring and also would require disclosure under the guidance.

The Company provides certain provisions within its software licensing agreements to indemnify its customers from any claim, suit or proceeding arising from alleged or actual intellectual property infringement. These provisions continue in perpetuity, along with the Company's software licensing agreements. The Company has never incurred a liability relating to one of these indemnification provisions, and management believes that the likelihood of any future payout relating to these provisions is remote. Therefore, the Company has not recorded a liability during any period for these indemnification provisions.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Capitalization

12 Months Ended

Mar. 31, 2012

Capitalization [Abstract]

Capitalization

7.	Capitalization

As of March 31, 2012 and 2011, the Company had 250,000 shares of common stock and 50,000 shares of preferred stock authorized. As of March 31, 2012 and 2011, there were no shares of preferred stock outstanding.

On November 13, 2008, the Board of Directors of the Company adopted a Rights Plan and declared a dividend distribution of one Right for each outstanding share of common stock to shareholders of record on November 24, 2008. Each Right, when exercisable, entitles the registered holder to purchase one one-thousandth of a share of Series A Junior Participating Preferred Stock, par value $0.01 per share, at a purchase price of eighty dollars per one one-thousandth of a share, subject to adjustment. Of the 50,000 shares of preferred stock authorized under the Company's certificate of incorporation, 150 have been designated as Series A Junior Participating Preferred.

The Rights will become exercisable following the tenth business day after (i) a person or group announces the acquisition of 15% or more of the Company's common stock or (ii) commencement of a tender or exchange offer, the consummation of which would result in ownership by the person or group of 15% or more of the Company's common stock. The Company is also entitled to redeem the Rights at $0.001 per right under certain circumstances. The Rights expire on November 14, 2018, if not exercised or redeemed.

Common Stock

The Company had 44,594 and 43,965 shares of common stock, par value $0.01, outstanding at March 31, 2012 and March 31, 2011, respectively.

As of March 31, 2012, the Company is authorized to repurchase up to a total of $170,000 of its common stock through March 31, 2013 under its share repurchase program. As of March 31, 2012, the Company has repurchased approximately $117,157 under the share repurchase authorization and may repurchase an additional $52,843 of its common stock under the current program through March 31, 2013.

Shares Reserved for Issuance

The Company has reserved 7,769 shares to allow for the exercise of all outstanding options and vesting of restricted stock units at March 31, 2012.

Stock Plans

12 Months Ended

Mar. 31, 2012

Stock Plans [Abstract]

Stock Plans

8.	Stock Plans

As of March 31, 2012, the Company maintains two stock incentive plans, the 1996 Stock Option Plan (the "Plan") and the 2006 Long-Term Stock Incentive Plan (the "LTIP").

Under the Plan, the Company may grant non-qualified stock options to purchase 11,705 shares of common stock to certain officers and employees. Stock options are granted at the discretion of the Board and expire 10 years from the date of the grant. At March 31, 2012, there were 562 options available for future grant under the Plan.

The LTIP permits the grant of incentive stock options, non-qualified stock options, restricted stock awards, restricted stock units, stock appreciation rights, performance stock awards and stock unit awards based on, or related to, shares of the Company's common stock. On each April 1, the number of shares available for issuance under the LTIP is increased, if applicable, such that the total number of shares available for awards under the LTIP as of any April 1 is equal to 5% of the number of outstanding shares of the Company's common stock on that April 1. As of March 31, 2012, approximately 516 shares were available for future issuance under the LTIP.

As of March 31, 2012, the Company has granted non-qualified stock options and restricted stock units under its stock incentive plans. Equity awards granted by the Company under its stock incentive plans generally vest quarterly over a four-year period, except that the shares that would otherwise vest quarterly over the first 12 months do not vest until the first anniversary of the grant. During fiscal 2012, the Company granted a total of 53 stock options and 28 restricted stock units to members of the Company's Board of Directors that vest over a one year period. The Company anticipates that future grants under its stock incentive plans will continue to include both non-qualified stock options and restricted stock units.

The Company estimated the fair value of stock options granted using the Black-Scholes formula. The average expected life was determined according to the "simplified method", which is the mid-point between the vesting date and the end of the contractual term. During fiscal 2013, the Company anticipates that it will begin incorporating its historical data into the expected term calculation for stock options granted. At this point, the Company will have an additional year of vesting and will be able to demonstrate significant exercise activity to provide a reasonable basis for incorporating historical data into its expected term of future stock option grants. As a result, during fiscal 2013, the Company anticipates that its calculation of expected term will include a combination of actual exercise data and an assumption on when the remaining outstanding options with similar characteristics will be exercised.

The risk-free interest rate is determined by reference to U.S. Treasury yield curve rates with a remaining term equal to the expected life assumed at the date of grant. Forfeitures are estimated based on the Company's historical analysis of actual stock option forfeitures. Expected volatility for the fiscal years ended March 31, 2010, 2011 and 2012 was calculated based on a blended approach that included historical volatility of a peer group, the implied volatility of the Company's traded options with a remaining maturity greater than six months and the historical realized volatility of the Company's common stock from the date of its initial public offering to the respective stock option grant date.

The assumptions used in the Black-Scholes option-pricing model are as follows:


	Year Ended March 31,
	2012	2011	2010
Dividend yield	None	None	None
Expected volatility	42% - 47%	40% - 45%	40% - 45%
Weighted average expected volatility	45%	44%	42%
Risk-free interest rates	1.06% - 2.56%	1.18% - 2.93%	0.24% - 3.14%
Expected life (in years)	6.2	6.2	6.3

The following table presents the stock-based compensation expense included in cost of services revenue, sales and marketing, research and development and general and administrative expenses for the years ended March 31, 2012, 2011 and 2010.


	Year Ended March 31,
	2012		2011		2010
Cost of services revenue	$	648	$	346	$	463
Sales and marketing		9,818		7,040		6,827
Research and development		2,270		1,719		2,030
General and administrative		8,690		6,518		5,592

Stock-based compensation expense	$	21,426	$	15,623	$	14,912

The Company recognized a tax benefit related to stock-based compensation of $7,276 in the year ended March 31, 2012, $5,352 in the year ended March 31, 2011 and $5,135 in the year ended March 31, 2010.

As of March 31, 2012, there was approximately $59,081 of unrecognized stock-based compensation expense, net of estimated forfeitures, related to non-vested stock option and restricted stock unit awards that is expected to be recognized over a weighted average period of 2.70 years. To the extent the actual forfeiture rate is different from what the Company has anticipated, stock-based compensation related to these awards will be different from the Company's expectations.

The following summarizes the activity for the Company's two stock incentive plans from March 31, 2009 to March 31, 2012:


Options	Number of Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding at March 31, 2009		8,779		$	9.30
Options granted		743			20.81
Options exercised		(1,246	)		8.25
Options forfeited		(183	)		14.46
Options expired		(23	)		17.01

Outstanding at March 31, 2010		8,070			10.38
Options granted		1,191			27.27
Options exercised		(2,066	)		8.30
Options forfeited		(144	)		15.62
Options expired		(17	)		11.61

Outstanding at March 31, 2011		7,034			13.75
Options granted		1,240			41.74
Options exercised		(1,513	)		11.98
Options forfeited		(99	)		25.61
Options expired		(6	)		8.23

Outstanding at March 31, 2012		6,656		$	19.19		6.22	$	202,782

Vested or expected to vest at March 31, 2012		6,528		$	18.71		6.13	$	200,883

Exercisable at March 31, 2012		4,115		$	11.45		4.69	$	157,155

The weighted average fair value of stock options granted was $18.77 per share, $12.23 per share, and $9.31 per share during the years ended March 31, 2012, 2011 and 2010, respectively. The total intrinsic value of options exercised was $51,145, $39,119, and $15,795 in the years ended March 31, 2012, 2011 and 2010, respectively. The Company's policy is to issue new shares upon exercise of options as the Company does not hold shares in treasury.

Restricted stock unit activity is as follows:


Non-Vested Restricted Stock Units	Number of Awards			Weighted Average Grant Date Fair Value
Non-vested as of March 31, 2009		992		$	13.44
Granted		329			20.67
Vested		(216	)		14.95
Forfeited		(94	)		14.67

Non-vested as of March 31, 2010		1,011			15.33
Granted		507			26.96
Vested		(403	)		14.44
Forfeited		(105	)		17.71

Non-vested as of March 31, 2011		1,010			21.27
Granted		623			42.07
Vested		(439	)		19.61
Forfeited		(81	)		27.14

Non-vested as of March 31, 2012		1,113		$	33.24

The total fair value of the restricted stock units that vested during the years ended March 31, 2012, 2011 and 2010 was $18,579, $10,157 and $4,245, respectively.

The following table summarizes information on stock options outstanding under the Plan and LTIP at March 31, 2012:


Range of Exercise Prices	Options Outstanding March 31, 2012		Weighted-Average				Options Exercisable at March 31, 2012		Weighted- Average Exercise Price
Range of Exercise Prices	Options Outstanding March 31, 2012		Remaining Contractual Life		Exercise Price		Options Exercisable at March 31, 2012		Weighted- Average Exercise Price
$ 4.00 - 4.70		1,071		2.62	$	4.46		1,071	$	4.46
4.80 - 11.12		1,563		4.55		8.57		1,272		7.99
11.37 - 16.99		1,179		5.67		14.85		1,134		14.80
17.19 - 26.83		1,402		8.03		24.66		584		23.56
27.02 - 41.55		1,360		9.36		39.31		54		30.12
43.30 - 53.81		81		9.82		49.76		0		0

$ 4.00 - 53.81		6,656		6.22	$	19.19		4,115	$	11.45

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Income Taxes

12 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Income Taxes

9.	Income Taxes

The components of income before income taxes were as follows:


	Year Ended March 31,
	2012		2011		2010
Domestic	$	43,526	$	31,553	$	29,927
Foreign		6,466		4,762		2,200

	$	49,992	$	36,315	$	32,127

The components of income tax expense (benefit) were as follows:


	Year Ended March 31,
	2012			2011			2010
Current:
Federal	$	18,716		$	6,311		$	3,766
State		2,292			1,781			2,124
Foreign		2,037			(579	)		1,361
Deferred:
Federal		(3,196	)		2,883			6,348
State		(2,673	)		4,501			(91	)
Foreign		876			414			214

	$	18,052		$	15,311		$	13,722

A reconciliation of the statutory tax rates and the effective tax rates for the years ended March 31, 2012, 2011 and 2010 are as follows:


	Year Ended March 31,
	2012			2011			2010
Statutory federal income tax expense rate		35.0	%		35.0	%		35.0	%
State and local income tax expense, net of federal income tax effect		2.6			3.9			4.4
Impact of state tax rate change on deferred tax assets		1.0			0.5			(0.5	)
Foreign earnings taxed at different rates		1.8			0.5			2.3
Permanent differences		3.0			1.5			2.3
Foreign tax credits		(1.4	)		(1.4	)		3.5
Research credits		(2.7	)		(5.0	)		(4.1	)
Tax reserves		—			(4.6	)		1.9
Change in valuation allowance		(3.2	)		11.9			—
Other differences, net		—			(0.1	)		(2.1	)

Effective income tax expense		36.1	%		42.2	%		42.7	%

Deferred tax assets arise due to the recognition of income and expense items for tax purposes, which differ from those used for financial statement purposes. The Company assesses the likelihood that its deferred tax assets will be recovered from future taxable income, and to the extent that the Company believes recovery is not likely, the Company establishes a valuation allowance. The significant components of the Company's deferred tax assets are as follows:


	March 31,
	2012			2011
Deferred tax assets:
Tax credits	$	18,478		$	18,239
Stock-based compensation		11,832			10,656
Deferred revenue		4,385			3,438
Net operating losses		1,858			2,625
Depreciation and amortization		1,289			1,255
Allowance for doubtful accounts the other reserves		1,049			961
Accrued expenses		1,107			911

Total deferred tax assets		39,998			38,085
Less: valuation allowance		(1,420	)		(4,306	)

Net deferred tax assets	$	38,578		$	33,779

At March 31, 2012, the Company maintained valuation allowances totaling $1,420 against its deferred tax assets. Specifically, the Company has a valuation allowance of $1,343 against certain state research tax credits due to uncertainties related to the ability to utilize such state research tax credits before they expire. The Company based its valuation allowance on its estimates of taxable income by legal entity and the period over which its state research tax credits will be recoverable. In addition, the Company has a valuation allowance of $77 against foreign net operating loss carryforwards in a certain international jurisdiction. In assessing the need for a valuation allowance against its net operating loss carryforwards in such international jurisdiction, the Company considered projected future income as part of its analysis.

It is the Company's intention to reinvest undistributed earnings of its foreign subsidiaries and thereby infinitely postpone their remittance. As a result, deferred U.S. income taxes have not been provided on undistributed earnings of foreign subsidiaries of the Company. The cumulative amount of unremitted earnings from the foreign subsidiaries that is expected to be permanently reinvested was approximately $5,277 on March 31, 2012.

Excess tax benefits related to share-based payments are credited to equity. When determining this excess tax benefit, the Company elected to follow the tax law approach. As a result, the Company's excess tax benefit which was recorded to equity was approximately $16,072 and $7,084 for the years ended March 31, 2012 and 2011, respectively.

At March 31, 2012, the Company has state net operating loss (NOL) carryforwards of approximately $2,074 and NOL carryforwards for foreign tax purposes of approximately $6,973.

At March 31, 2012, the Company has federal and state research tax credit (R&D credits) carryforwards of approximately $12,250 and $5,155, respectively. The federal research tax credit carryforwards expire from 2022 through 2032, and the state research tax credit carryforwards expire from 2014 through 2027. At March 31, 2012, the Company has federal Alternative Minimum Tax credit carryforwards of $1,586.

The Company conducts business globally and as a result, files income tax returns in the United States and in various state and foreign jurisdictions. In the normal course of business, the Company is subject to examination by taxing authorities throughout the world, including such major jurisdictions as the United States, Australia, Canada, Germany, Netherlands and United Kingdom. The Company is not currently under audit in any tax jurisdiction. The following table summarizes the tax years in the Company's major tax jurisdictions that remain subject to income tax examinations by tax authorities as of March 31, 2012. The years subject to income tax examination in the Company's foreign jurisdictions cover the maximum time period with respect to these jurisdictions. Due to NOL carryforwards, in some cases the tax years continue to remain subject to examination with respect to such NOLs.


Tax Jurisdiction	Years Subject to Income Tax Examination
U.S. Federal		2001 - Present
New Jersey		2002 - Present
Foreign jurisdictions		2006 - Present


Balance at March 31, 2009	$	4,539
Additions for tax positions related to fiscal 2010		447
Additions for tax positions related to prior years		127
Settlements		—
Reductions related to the expiration of statutes of limitations		—
Foreign currency translation adjustment		116

Balance at March 31, 2010		5,229
Additions for tax positions related to fiscal 2011		512
Additions for tax positions related to prior years		86
Settlements		—
Reductions related to the expiration of statutes of limitations		(1,447	)
Foreign currency translation adjustment		101

Balance at March 31, 2011		4,481
Additions for tax positions related to fiscal 2012		582
Additions for tax positions related to prior years		96
Settlements		—
Reductions related to the expiration of statutes of limitations		(390	)
Foreign currency translation adjustment		(70	)

Balance at March 31, 2012	$	4,699

All of the Company's unrecognized tax benefits at March 31, 2012 of $4,699, if recognized, would favorably affect the effective tax rate. Components of the reserve are classified as either current or long-term in the Consolidated Balance Sheet based on when the Company expects each of the items to be settled. Accordingly, the Company has recorded its unrecognized tax benefits of $4,699 and $4,481 and the related accrued interest and penalties of $784 and $842 in Other Liabilities on the Consolidated Balance Sheet at March 31, 2012 and March 31, 2011, respectively. The Company believes that it is reasonably possible that approximately $404 of its currently remaining unrecognized tax benefits and approximately $201 of related accrued interest and penalties may be realized by the end of the fiscal year ending March 31, 2013 as a result of the lapse of the statute of limitations. Interest and penalties related to unrecognized tax benefits are recorded in income tax expense. In the years ended March 31, 2012, 2011 and 2010, the Company recognized $117, $152 and $138, respectively, of interest and penalties in the Consolidated Statement of Income.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 9
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Employee Benefit Plan

12 Months Ended

Mar. 31, 2012

Employee Benefit Plan [Abstract]

Employee Benefit Plan

10.

Employee Benefit Plan

The Company has a defined contribution plan, as allowed under Section 401(k) of the Internal Revenue Code, covering substantially all employees. Starting January 1, 2012, the Company makes contributions equal to a discretionary percentage of the employee's contributions determined by the Company. As a result, total Company contributions during the fiscal year ending March 31, 2012 were $265.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

+ Details

Segment Information

12 Months Ended

Mar. 31, 2012

Segment Information [Abstract]

Segment Information

11.

Segment Information

The Company operates in one reportable segment, storage software solutions. The Company's products and services are sold throughout the world, through direct and indirect sales channels. The Company's chief operating decision maker, the chief executive officer, evaluates the performance of the Company presented on a consolidated basis, accompanied by information about revenue by geographic region for purposes of tracking distribution of resources and analyzing overall return on investment for both domestic and international operations. The chief operating decision maker does not receive discrete financial information about asset allocation, expense allocation or profitability from the Company's storage products or services.

Revenues by geography are based upon the billing address of the customer. All transfers between geographic regions have been eliminated from consolidated revenues. The following table sets forth revenue and long-lived assets by geographic area:


	Year Ended March 31,
	2012		2011		2010
Revenue:
United States	$	248,749	$	190,706	$	169,343
Other		157,890		124,070		101,682

	$	406,639	$	314,776	$	271,025

No individual country other than the United States accounts for 10% or more of revenues in the years ended March 31, 2012, 2011 and 2010. Revenue included in the "Other" caption above primarily relates to the Company's operations in Europe, Australia, Canada and Asia.


	March 31,
	2012		2011
Long-lived assets:
United States	$	8,131	$	4,768
Other		5,346		3,265

	$	13,477	$	8,033

At March 31, 2012 and 2011, the United Kingdom had long-lived assets of $2,872 and $1,072, respectively. No other individual country other than the United States accounts for 10% or more of long-lived assets as of March 31, 2012 and 2011.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 34
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

+ Details

Selected Quarterly Financial Data

12 Months Ended

Mar. 31, 2012

Selected Quarterly Financial Data [Abstract]

Selected Quarterly Financial Data

12.

Selected Quarterly Financial Data (unaudited)


	Quarter Ended
	June 30		September 30		December 31		March 31
Fiscal 2012
Total revenue	$	91,527	$	97,458	$	103,640	$	114,014
Gross margin		79,484		84,384		90,030		99,334
Net income		7,039		7,899		7,160		9,842
Net income per common share:
Basic(1)	$	0.16	$	0.18	$	0.16	$	0.22
Diluted(1)	$	0.15	$	0.17	$	0.15	$	0.21

	Quarter Ended
	June 30		September 30		December 31		March 31
Fiscal 2011
Total revenue	$	66,300	$	75,226	$	83,629	$	89,621
Gross margin		56,780		65,709		73,475		77,797
Net income		3,498		5,419		7,252		4,835
Net income per common share:
Basic(1)	$	0.08	$	0.13	$	0.17	$	0.11
Diluted(1)	$	0.08	$	0.12	$	0.16	$	0.10

(1)	Per common share amounts for the quarters and full year have been calculated separately. Accordingly, quarterly amounts do not add to the annual amount because of differences in the weighted average common shares outstanding during each period used in the basic and diluted calculations.

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Valuation And Qualifying Accounts

12 Months Ended

Mar. 31, 2012

Valuation And Qualifying Accounts [Abstract]

Valuation And Qualifying Accounts

Schedule II — Valuation and Qualifying Accounts


	Balance at Beginning of Year		Charged (Credited) to Costs and Expenses			Deductions		Balance at End of Year
	(In thousands)
Year Ended March 31, 2010
Allowance for doubtful accounts	$	193	$	158		$	59	$	292
Year Ended March 31, 2011
Allowance for doubtful accounts	$	292	$	(42	)	$	144	$	106
Valuation allowance for deferred taxes	$	—	$	4,306		$	—	$	4,306
Year Ended March 31, 2012
Allowance for doubtful accounts	$	106	$	(2	)	$	7	$	97
Valuation allowance for deferred taxes	$	4,306	$	(2,886	)	$	—	$	1,420

Summary Of Significant Accounting Policies (Policy)

12 Months Ended

Mar. 31, 2012

Summary Of Significant Accounting Policies [Abstract]

Basis Of Presentation

Basis of Presentation

The consolidated financial statements include the accounts of the Company. All intercompany transactions and balances have been eliminated.

Use Of Estimates

Use of Estimates

Revenue Recognition

Revenue Recognition

The Company considers the four basic revenue recognition criteria for each of the elements as follows:

•

Net Income Per Common Share

Net Income per Common Share

The following table sets forth the computation of basic and diluted net income per common share:


	Year Ended March 31,
	2012		2011		2010
Net income	$	31,940	$	21,004	$	18,405

Basic net income per common share:
Basic weighted average shares outstanding		44,089		43,283		42,133

Basic net income per common share	$	0.72	$	0.49	$	0.44

Diluted net income per common share:
Basic weighted average shares outstanding		44,089		43,283		42,133
Dilutive effect of stock options and restricted stock units		3,112		3,018		2,889

Diluted weighted average shares outstanding		47,201		46,301		45,022

Diluted net income per common share	$	0.68	$	0.45	$	0.41

Year Ended March 31,

2012

2011

2010

Stock options and restricted stock units

626

1,002

728

Software Development Costs

Software Development Costs

Accounts Receivable And Allowance For Doubtful Accounts

Accounts Receivable and Allowance for Doubtful Accounts

Accounting For Income Taxes

Accounting for Income Taxes

Cash And Cash Equivalents

Cash and Cash Equivalents

Concentration Of Credit Risk

Concentration of Credit Risk

The Company grants credit to customers in a wide variety of industries worldwide and generally does not require collateral. Credit losses relating to these customers have been minimal.

Fair Value Of Financial Instruments

Fair Value of Financial Instruments

Level 1 — Quoted prices in active markets for identical assets or liabilities.

Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The following table summarizes the composition of the Company's financial assets measured at fair value on a recurring basis at March 31, 2012 and March 31, 2011:


	March 31,
	2012		2011
Cash and cash equivalents:
Money market funds	$	232,037	$	182,911

All of the Company's financial instruments in the table above were classified and measured as Level 1 instruments.

Property And Equipment

Property and Equipment

Asset Retirement Obligation

Asset Retirement Obligation

Long-Lived Assets

Long-Lived Assets

Deferred Revenue

Deferred Revenue

Deferred revenue consists of the following:


	March 31,
	2012		2011
Current:
Deferred software revenue	$	3,764	$	237
Deferred services revenue		121,550		97,980

	$	125,314	$	98,217

Non-current:
Deferred services revenue	$	22,059	$	14,695

Accounting For Stock-Based Compensation

Accounting for Stock-Based Compensation

Share Repurchases

Share Repurchases

Sales Tax

Sales Tax

The Company records revenue net of sales tax.

Advertising Costs

Advertising Costs

The Company expenses advertising costs as incurred. Advertising expenses were $4,582, $3,819, and $2,121 for the years ended March 31, 2012, 2011 and 2010, respectively.

Shipping And Handling Costs

Shipping and Handling Costs

Shipping and handling costs are included in cost of revenues for all periods presented.

Foreign Currency Translation

Foreign Currency Translation

Comprehensive Income

Comprehensive Income


	Year Ended March 31,
	2012			2011		2010
Net income	$	31,940		$	21,004	$	18,405
Foreign currency translation adjustment		(68	)		419		80

Total comprehensive income	$	31,872		$	21,423	$	18,485

Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2012

Summary Of Significant Accounting Policies [Abstract]

Computation Of Basic And Diluted Net Income Per Common Share


	Year Ended March 31,
	2012		2011		2010
Net income	$	31,940	$	21,004	$	18,405

Basic net income per common share:
Basic weighted average shares outstanding		44,089		43,283		42,133

Basic net income per common share	$	0.72	$	0.49	$	0.44

Diluted net income per common share:
Basic weighted average shares outstanding		44,089		43,283		42,133
Dilutive effect of stock options and restricted stock units		3,112		3,018		2,889

Diluted weighted average shares outstanding		47,201		46,301		45,022

Diluted net income per common share	$	0.68	$	0.45	$	0.41

Summary Of The Potential Outstanding Common Stock Equivalents

Year Ended March 31,

2012

2011

2010

Stock options and restricted stock units

626

1,002

728

Financial Assets Measured At Fair Value On Recurring Basis


	March 31,
	2012		2011
Cash and cash equivalents:
Money market funds	$	232,037	$	182,911

Deferred Revenue


	March 31,
	2012		2011
Current:
Deferred software revenue	$	3,764	$	237
Deferred services revenue		121,550		97,980

	$	125,314	$	98,217

Non-current:
Deferred services revenue	$	22,059	$	14,695

Comprehensive Income


	Year Ended March 31,
	2012			2011		2010
Net income	$	31,940		$	21,004	$	18,405
Foreign currency translation adjustment		(68	)		419		80

Total comprehensive income	$	31,872		$	21,423	$	18,485

- Definition

The entire disclosure for comprehensive income. Includes, but is not limited to, the following: 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. Components of comprehensive income include: (1) foreign currency translation adjustments; (2) gains (losses) on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (3) gains (losses) on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (4) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (5) unrealized holding gains (losses) on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (6) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (7) the net gain (loss) and net prior service cost or credit for pension plans and other postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14-26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6522872

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-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e689-108580

+ Details

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References + Details

Property And Equipment (Tables)

12 Months Ended

Mar. 31, 2012

Property And Equipment [Abstract]

Schedule Of Property And Equipment


	March 31,
	2012			2011
Computer equipment	$	11,267		$	10,609
Other machinery and equipment		9,525			8,167
Leasehold improvements		6,631			4,375
Purchased software		1,818			1,623
Furniture and fixtures		2,037			1,684

		31,278			26,458
Less: Accumulated depreciation and amortization		(23,094	)		(20,058	)

	$	8,184		$	6,400

Accrued Liabilities (Tables)

12 Months Ended

Mar. 31, 2012

Accrued Liabilities [Abstract]

Schedule Of Accrued Liabilities


	March 31,
	2012		2011
Compensation and related payroll taxes	$	28,391	$	19,204
Other		17,497		14,271

	$	45,888	$	33,475

Commitments And Contingencies (Tables)

12 Months Ended

Mar. 31, 2012

Commitments And Contingencies [Abstract]

Future Minimum Lease Payments Under All Operating Leases


Year Ending March 31:
2013	$	8,637
2014		7,139
2015		6,433
2016		2,804
2017		196

	$	25,209

Stock Plans (Tables)

12 Months Ended

Mar. 31, 2012

Stock Plans [Abstract]

Schedule Of Stock Option Valuation Assumptions


	Year Ended March 31,
	2012	2011	2010
Dividend yield	None	None	None
Expected volatility	42% - 47%	40% - 45%	40% - 45%
Weighted average expected volatility	45%	44%	42%
Risk-free interest rates	1.06% - 2.56%	1.18% - 2.93%	0.24% - 3.14%
Expected life (in years)	6.2	6.2	6.3

Stock-Based Compensation Expense


	Year Ended March 31,
	2012		2011		2010
Cost of services revenue	$	648	$	346	$	463
Sales and marketing		9,818		7,040		6,827
Research and development		2,270		1,719		2,030
General and administrative		8,690		6,518		5,592

Stock-based compensation expense	$	21,426	$	15,623	$	14,912

Schedule Of Stock Option Activity


Options	Number of Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding at March 31, 2009		8,779		$	9.30
Options granted		743			20.81
Options exercised		(1,246	)		8.25
Options forfeited		(183	)		14.46
Options expired		(23	)		17.01

Outstanding at March 31, 2010		8,070			10.38
Options granted		1,191			27.27
Options exercised		(2,066	)		8.30
Options forfeited		(144	)		15.62
Options expired		(17	)		11.61

Outstanding at March 31, 2011		7,034			13.75
Options granted		1,240			41.74
Options exercised		(1,513	)		11.98
Options forfeited		(99	)		25.61
Options expired		(6	)		8.23

Outstanding at March 31, 2012		6,656		$	19.19		6.22	$	202,782

Vested or expected to vest at March 31, 2012		6,528		$	18.71		6.13	$	200,883

Exercisable at March 31, 2012		4,115		$	11.45		4.69	$	157,155

Schedule Of Restricted Stock Unit Activity


Non-Vested Restricted Stock Units	Number of Awards			Weighted Average Grant Date Fair Value
Non-vested as of March 31, 2009		992		$	13.44
Granted		329			20.67
Vested		(216	)		14.95
Forfeited		(94	)		14.67

Non-vested as of March 31, 2010		1,011			15.33
Granted		507			26.96
Vested		(403	)		14.44
Forfeited		(105	)		17.71

Non-vested as of March 31, 2011		1,010			21.27
Granted		623			42.07
Vested		(439	)		19.61
Forfeited		(81	)		27.14

Non-vested as of March 31, 2012		1,113		$	33.24

Summary Of Stock Options Outstanding Under Plan And LTIP


Range of Exercise Prices	Options Outstanding March 31, 2012		Weighted-Average				Options Exercisable at March 31, 2012		Weighted- Average Exercise Price
Range of Exercise Prices	Options Outstanding March 31, 2012		Remaining Contractual Life		Exercise Price		Options Exercisable at March 31, 2012		Weighted- Average Exercise Price
$ 4.00 - 4.70		1,071		2.62	$	4.46		1,071	$	4.46
4.80 - 11.12		1,563		4.55		8.57		1,272		7.99
11.37 - 16.99		1,179		5.67		14.85		1,134		14.80
17.19 - 26.83		1,402		8.03		24.66		584		23.56
27.02 - 41.55		1,360		9.36		39.31		54		30.12
43.30 - 53.81		81		9.82		49.76		0		0

$ 4.00 - 53.81		6,656		6.22	$	19.19		4,115	$	11.45

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References + Details

Income Taxes (Tables)

12 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Schedule Of Components Of Income Before Income Taxes


	Year Ended March 31,
	2012		2011		2010
Domestic	$	43,526	$	31,553	$	29,927
Foreign		6,466		4,762		2,200

	$	49,992	$	36,315	$	32,127

Schedule Of Components Of Income Tax Expense (Benefit)


	Year Ended March 31,
	2012			2011			2010
Current:
Federal	$	18,716		$	6,311		$	3,766
State		2,292			1,781			2,124
Foreign		2,037			(579	)		1,361
Deferred:
Federal		(3,196	)		2,883			6,348
State		(2,673	)		4,501			(91	)
Foreign		876			414			214

	$	18,052		$	15,311		$	13,722

Schedule Of Reconciliation Of The Statutory Tax Rates And The Effective Tax Rates


	Year Ended March 31,
	2012			2011			2010
Statutory federal income tax expense rate		35.0	%		35.0	%		35.0	%
State and local income tax expense, net of federal income tax effect		2.6			3.9			4.4
Impact of state tax rate change on deferred tax assets		1.0			0.5			(0.5	)
Foreign earnings taxed at different rates		1.8			0.5			2.3
Permanent differences		3.0			1.5			2.3
Foreign tax credits		(1.4	)		(1.4	)		3.5
Research credits		(2.7	)		(5.0	)		(4.1	)
Tax reserves		—			(4.6	)		1.9
Change in valuation allowance		(3.2	)		11.9			—
Other differences, net		—			(0.1	)		(2.1	)

Effective income tax expense		36.1	%		42.2	%		42.7	%

Schedule Of Components Of The Company's Deferred Tax Assets


	March 31,
	2012			2011
Deferred tax assets:
Tax credits	$	18,478		$	18,239
Stock-based compensation		11,832			10,656
Deferred revenue		4,385			3,438
Net operating losses		1,858			2,625
Depreciation and amortization		1,289			1,255
Allowance for doubtful accounts the other reserves		1,049			961
Accrued expenses		1,107			911

Total deferred tax assets		39,998			38,085
Less: valuation allowance		(1,420	)		(4,306	)

Net deferred tax assets	$	38,578		$	33,779

Schedule Of Tax Years Subject To Income Tax Examination


Tax Jurisdiction	Years Subject to Income Tax Examination
U.S. Federal		2001 - Present
New Jersey		2002 - Present
Foreign jurisdictions		2006 - Present

Schedule Of Changes In Unrecognized Tax Benefits


Balance at March 31, 2009	$	4,539
Additions for tax positions related to fiscal 2010		447
Additions for tax positions related to prior years		127
Settlements		—
Reductions related to the expiration of statutes of limitations		—
Foreign currency translation adjustment		116

Balance at March 31, 2010		5,229
Additions for tax positions related to fiscal 2011		512
Additions for tax positions related to prior years		86
Settlements		—
Reductions related to the expiration of statutes of limitations		(1,447	)
Foreign currency translation adjustment		101

Balance at March 31, 2011		4,481
Additions for tax positions related to fiscal 2012		582
Additions for tax positions related to prior years		96
Settlements		—
Reductions related to the expiration of statutes of limitations		(390	)
Foreign currency translation adjustment		(70	)

Balance at March 31, 2012	$	4,699

- Definition

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

+ References + Details

Segment Information (Tables)

12 Months Ended

Mar. 31, 2012

Segment Information [Abstract]

Schedule Of Revenue By Geographic Area


	Year Ended March 31,
	2012		2011		2010
Revenue:
United States	$	248,749	$	190,706	$	169,343
Other		157,890		124,070		101,682

	$	406,639	$	314,776	$	271,025

Schedule Of Long-Lived Assets By Geographic Area


	March 31,
	2012		2011
Long-lived assets:
United States	$	8,131	$	4,768
Other		5,346		3,265

	$	13,477	$	8,033

Selected Quarterly Financial Data (Tables)

12 Months Ended

Mar. 31, 2012

Selected Quarterly Financial Data [Abstract]

Schedule Of Selected Quarterly Financial Data


	Quarter Ended
	June 30		September 30		December 31		March 31
Fiscal 2012
Total revenue	$	91,527	$	97,458	$	103,640	$	114,014
Gross margin		79,484		84,384		90,030		99,334
Net income		7,039		7,899		7,160		9,842
Net income per common share:
Basic(1)	$	0.16	$	0.18	$	0.16	$	0.22
Diluted(1)	$	0.15	$	0.17	$	0.15	$	0.21

	Quarter Ended
	June 30		September 30		December 31		March 31
Fiscal 2011
Total revenue	$	66,300	$	75,226	$	83,629	$	89,621
Gross margin		56,780		65,709		73,475		77,797
Net income		3,498		5,419		7,252		4,835
Net income per common share:
Basic(1)	$	0.08	$	0.13	$	0.17	$	0.11
Diluted(1)	$	0.08	$	0.12	$	0.16	$	0.10

(1)	Per common share amounts for the quarters and full year have been calculated separately. Accordingly, quarterly amounts do not add to the annual amount because of differences in the weighted average common shares outstanding during each period used in the basic and diluted calculations.

Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2012 USD ($) mo yr item d	Mar. 31, 2011 USD ($)	Mar. 31, 2010 USD ($)	Mar. 31, 2009 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of days for other professional services \| d	90
Sources of primary revenue \| item	2
Net deferred tax assets	$ 38,578	$ 33,779
Valuation allowance for deferred tax assets	1,420
Asset retirement obligation	552
Excess tax benefits recognized as a financing cash inflow	16,009	7,044	$ 3,395
Reduction of common stock and additional paid-in capital as result of common stock repurchases	6,799	7,246
Reduction of accumulated deficit as result of common stock repurchases	$ 38,840	24,212
Length of customer support agreement - in years \| yr	1
Advertising expenses	$ 4,582	3,819	2,121
Duration of forward contracts utilized for hedging, Minimum (in months)	1
Duration of forward contracts utilized for hedging, Maximum (in months) \| mo	3
Net realized gains (losses) related to settlement of forward exchange contracts recorded in general and administrative expenses	$ 37	(48)
Unrecognized tax benefits which would favorably affect the effective tax rate once recognized	4,699	4,481	5,229	$ 4,539
Accrued interest and penalties	784	842
Net foreign currency transaction losses	$ 232	$ 623	$ 647
Dell [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of sales in relation to total revenues through Company's reseller and original equipment manufacturer agreement	22.00%	23.00%	24.00%
Percentage of accounts receivable	25.00%	25.00%
Arrow [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of sales in relation to total revenues through Company's reseller agreement	26.00%	25.00%	24.00%
Percentage of accounts receivable	30.00%	32.00%
Computer Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and Equipment, Depreciation period, Maximum (in years) \| yr	3
Property and Equipment, Depreciation period, Minimum \| mo	18
Furniture And Fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and Equipment, Depreciation period, Maximum (in years) \| yr	5
Property and Equipment, Depreciation period, Minimum \| yr	3

Summary Of Significant Accounting Policies (Computation Of Basic And Diluted Net Income Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2010

Sep. 30, 2010

Jun. 30, 2010

Mar. 31, 2012

Mar. 31, 2011

Mar. 31, 2010

Summary Of Significant Accounting Policies [Abstract]

Net income

$ 9,842

$ 7,160

$ 7,899

$ 7,039

$ 4,835

$ 7,252

$ 5,419

$ 3,498

$ 31,940

$ 21,004

$ 18,405

Basic weighted average shares outstanding

44,089

43,283

42,133

Basic net income per common share

$ 0.22

^[1]

$ 0.16

^[1]

$ 0.18

^[1]

$ 0.16

^[1]

$ 0.11

^[1]

$ 0.17

^[1]

$ 0.13

^[1]

$ 0.08

^[1]

$ 0.72

$ 0.49

$ 0.44

Dilutive effect of stock options and restricted stock units

3,112

3,018

2,889

Diluted weighted average shares outstanding

47,201

46,301

45,022

Diluted net income per common share

$ 0.21

^[1]

$ 0.15

^[1]

$ 0.17

^[1]

$ 0.15

^[1]

$ 0.10

^[1]

$ 0.16

^[1]

$ 0.12

^[1]

$ 0.08

^[1]

$ 0.68

$ 0.45

$ 0.41

[1]	Per common share amounts for the quarters and full year have been calculated separately. Accordingly, quarterly amounts do not add to the annual amount because of differences in the weighted average common shares outstanding during each period used in the basic and diluted calculations.

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 20

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 7
-Paragraph 18

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 19

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e565-108580

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Summary Of Significant Accounting Policies (Summary Of The Potential Outstanding Common Stock Equivalents) (Details) - shares shares in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Summary Of Significant Accounting Policies [Abstract]
Stock options and restricted stock units (anti-dilutive)	626	1,002	728

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Summary Of Significant Accounting Policies (Financial Assets Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 232,037	$ 182,911

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References + Details

Summary Of Significant Accounting Policies (Deferred Revenue) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011
Deferred Revenue Arrangement [Line Items]
Deferred revenue, Current	$ 125,314	$ 98,217
Deferred revenue, Non-current	22,059	14,695
Software [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue, Current	3,764	237
Services [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue, Current	$ 121,550	$ 97,980

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References + Details

Summary Of Significant Accounting Policies (Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Summary Of Significant Accounting Policies [Abstract]
Net income	$ 9,842	$ 7,160	$ 7,899	$ 7,039	$ 4,835	$ 7,252	$ 5,419	$ 3,498	$ 31,940	$ 21,004	$ 18,405
Foreign currency translation adjustment									(68)	419	80
Total comprehensive income									$ 31,872	$ 21,423	$ 18,485

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 8, 9, 10, 11, 12, 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A5
-Appendix A

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e557-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e540-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6508144

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity, net of tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 19, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 13, 20, 31
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-Subparagraph (b),(c)
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Property And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Property And Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 31,278	$ 26,458
Less: Accumulated depreciation and amortization	(23,094)	(20,058)
Property and equipment, net	8,184	6,400
Depreciation and amortization expense	4,484	3,906	$ 3,630
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	11,267	10,609
Other Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	9,525	8,167
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	6,631	4,375
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	1,818	1,623
Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 2,037	$ 1,684

Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011
Accrued Liabilities [Abstract]
Compensation and related payroll taxes	$ 28,391	$ 19,204
Other	17,497	14,271
Total accrued liabilities	$ 45,888	$ 33,475

Credit Facility (Details) $ in Thousands	1 Months Ended	12 Months Ended
Credit Facility (Details) $ in Thousands	Jul. 31, 2009 USD ($) yr	Mar. 31, 2012
Credit Facility [Abstract]
Maximum borrowing capacity under amended and restated credit facility \| $	$ 30,000
Line of credit borrowing period (in years) \| yr	3
Termination date of amended and restated credit facility		October 12, 2011

Commitments And Contingencies (Narrative) (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2012 USD ($) d	Mar. 31, 2011 USD ($)	Mar. 31, 2010 USD ($)
Commitments And Contingencies [Abstract]
Rent expenses	$ 8,498	$ 6,778	$ 5,628
Outstanding letter of credit	144
Non-cancellable purchase commitments, 2013	5,181
Non-cancellable purchase commitments, 2014	1,054
Non-cancellable purchase commitments, 2015	136
Non-cancellable purchase commitments, 2016	84
Non-cancellable purchase commitments, 2017	42
Non-cancellable purchase commitments, Total	6,497
Royalty expense	$ 1,611	$ 1,295	$ 1,290
Maximum software warranty period, days \| d	90

Commitments And Contingencies (Future Minimum Lease Payments Under All Operating Leases) (Details) $ in Thousands	Mar. 31, 2012 USD ($)
Commitments And Contingencies [Abstract]
Future minimum lease payments in 2013	$ 8,637
Future minimum lease payments in 2014	7,139
Future minimum lease payments in 2015	6,433
Future minimum lease payments in 2016	2,804
Future minimum lease payments in 2017	196
Future minimum lease payments, Total	$ 25,209

Capitalization (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2012 USD ($) $ / shares shares	Mar. 31, 2011 $ / shares shares	Nov. 13, 2008 item
Class of Stock [Line Items]
Common stock, shares authorized	250,000,000	250,000,000
Maximum amount authorized for repurchase of common stock under share repurchase program \| $	$ 170,000
Value of common stock repurchased under share repurchase program \| $	117,157
Remaining value of common stock to be repurchased under share repurchase program \| $	$ 52,843
Number of rights declared as dividend distribution for each outstanding share of common stock \| item			1
Description of exercise entitlement of each right	entitles the registered holder to purchase one one-thousandth of a share of Series A Junior Participating Preferred Stock, par value $<font class="_mt">0.01</font> per share, at a purchase price of eighty dollars per one one-thousandth of a share, subject to adjustment
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, par value \| $ / shares	$ 0.01	$ 0.01
Conditions under which rights become exercisable	following the tenth business day after (i) a person or group announces the acquisition of 15% or more of the Company's common stock or (ii) commencement of a tender or exchange offer, the consummation of which would result in ownership by the person or group of 15% or more of the Company's common stock
Redemption price of each Right \| $ / shares	$ 0.001
Expiration date of Rights	Nov. 14, 2018
Common stock, shares outstanding	44,594,000	43,965,000
Common stock, par value \| $ / shares	$ 0.01	$ 0.01
Series A Junior Participating Preferred [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized	150,000
Preferred stock, par value \| $ / shares	$ 0.01
Restricted Stock Units [Member]
Class of Stock [Line Items]
Shares reserved for issuance	7,769,000

Stock Plans (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2012 USD ($) yr $ / shares shares	Mar. 31, 2011 USD ($) $ / shares shares	Mar. 31, 2010 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	1,240	1,191	743
Recognized tax benefit related to stock-based compensation \| $	$ 7,276	$ 5,352	$ 5,135
Unrecognized stock-based compensation expense, net of estimated forfeitures \| $	$ 59,081
Awards expected to be recognized over a weighted average period (in years) \| yr	2.70
Weighted average fair value of stock options granted per share \| $ / shares	$ 18.77	$ 12.23	$ 9.31
Total intrinsic value of options exercised \| $	$ 51,145	$ 39,119	$ 15,795
Total fair value of restricted stock united - vested \| $	$ 18,579	$ 10,157	$ 4,245
1996 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant non-qualified stock options	11,705
Expiration term of stock options granted at the discretion of board from the date of the grant (in years)	10
Options available for future grant	562
2006 Long-Term Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for future grant	516
Percentage of outstanding shares available for awards under the LTIP as of any April 1st	5.00%
Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vesting period (in years)	four
Board Of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vesting period (in years)	one
Stock options granted	53
Board Of Directors [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	28

Stock Plans (Schedule Of Stock Option Valuation Assumptions) (Details) - yr	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Stock Plans [Abstract]
Dividend yield	0.00%	0.00%	0.00%
Expected volatility, minimum	42.00%	40.00%	40.00%
Expected volatility, maximum	47.00%	45.00%	45.00%
Weighted average expected volatility	45.00%	44.00%	42.00%
Risk-free interest rates, minimum	1.06%	1.18%	0.24%
Risk-free interest rates, maximum	2.56%	2.93%	3.14%
Expected life (in years)	6.2	6.2	6.3

Stock Plans (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 21,426	$ 15,623	$ 14,912
Cost Of Services Revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	648	346	463
Sales And Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	9,818	7,040	6,827
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,270	1,719	2,030
General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 8,690	$ 6,518	$ 5,592

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Stock Plans (Schedule Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2012 USD ($) yr $ / shares shares	Mar. 31, 2011 $ / shares shares	Mar. 31, 2010 $ / shares shares
Stock Plans [Abstract]
Number of Options, Outstanding, beginning balance \| shares	7,034	8,070	8,779
Number of Options, Options granted \| shares	1,240	1,191	743
Number of Options, Options exercised \| shares	(1,513)	(2,066)	(1,246)
Number of Options, Options forfeited \| shares	(99)	(144)	(183)
Number of Options, Options expired \| shares	(6)	(17)	(23)
Number of Options, Outstanding, ending balance \| shares	6,656	7,034	8,070
Number of Options, Vested or expected to vest at March 31, 2012 \| shares	6,528
Number of Options, Exercisable at March 31, 2012 \| shares	4,115
Weighted-Average Exercise Price, Outstanding, beginning balance \| $ / shares	$ 13.75	$ 10.38	$ 9.30
Weighted-Average Exercise Price, Options granted \| $ / shares	41.74	27.27	20.81
Weighted-Average Exercise Price, Options exercised \| $ / shares	11.98	8.30	8.25
Weighted-Average Exercise Price, Options forfeited \| $ / shares	25.61	15.62	14.46
Weighted-Average Exercise Price, Options expired \| $ / shares	8.23	11.61	17.01
Weighted-Average Exercise Price, Outstanding, ending balance \| $ / shares	19.19	$ 13.75	$ 10.38
Weighted-Average Exercise Price, Exercisable at March 31, 2012 \| $ / shares	11.45
Weighted-Average Exercise Price, Vested or expected to vest at March 31, 2012 \| $ / shares	$ 18.71
Weighted-Average Remaining Contractual Term (Years), Outstanding at March 31, 2012 \| yr	6.22
Weighted-Average Remaining Contractual Term (Years), Vested or expected to vest at March 31, 2012 \| yr	6.13
Weighted-Average Remaining Contractual Term (Years), Exercisable at March 31, 2012 \| yr	4.69
Aggregate Intrinsic Value, Outstanding at March 31, 2012 \| $	$ 202,782
Aggregate Intrinsic Value, Vested or expected to vest at March 31, 2012 \| $	200,883
Aggregate Intrinsic Value, Exercisable at March 31, 2012 \| $	$ 157,155

Stock Plans (Schedule Of Restricted Stock Unit Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Stock Plans [Abstract]
Number of Awards, Non-vested, beginning balance	1,010	1,011	992
Number of Awards, Granted	623	507	329
Number of Awards, Vested	(439)	(403)	(216)
Number of Awards, Forfeited	(81)	(105)	(94)
Number of Awards, Non-vested, ending balance	1,113	1,010	1,011
Weighted Average Grant Date Fair Value, Non-vested, beginning balance	$ 21.27	$ 15.33	$ 13.44
Weighted Average Grant Date Fair Value, Granted	42.07	26.96	20.67
Weighted Average Grant Date Fair Value, Vested	19.61	14.44	14.95
Weighted Average Grant Date Fair Value, Forfeited	27.14	17.71	14.67
Weighted Average Grant Date Fair Value, Non-vested, ending balance	$ 33.24	$ 21.27	$ 15.33

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References + Details

Stock Plans (Summary Of Stock Options Outstanding Under Plan And LTIP) (Details) shares in Thousands	12 Months Ended
	Mar. 31, 2012 yr $ / shares shares
$4.00 - $4.70 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	$ 4.00
Range of Exercise Prices, upper range limit	$ 4.70
Options Outstanding March 31, 2012 \| shares	1,071
Weighted-Average Remaining Contractual Life \| yr	2.62
Weighted-Average Exercise Price	$ 4.46
Options Exercisable at March 31, 2012 \| shares	1,071
Weighted-Average Exercise Price	$ 4.46
$4.80 - $11.12 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	4.80
Range of Exercise Prices, upper range limit	$ 11.12
Options Outstanding March 31, 2012 \| shares	1,563
Weighted-Average Remaining Contractual Life \| yr	4.55
Weighted-Average Exercise Price	$ 8.57
Options Exercisable at March 31, 2012 \| shares	1,272
Weighted-Average Exercise Price	$ 7.99
$11.37 - $16.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	11.37
Range of Exercise Prices, upper range limit	$ 16.99
Options Outstanding March 31, 2012 \| shares	1,179
Weighted-Average Remaining Contractual Life \| yr	5.67
Weighted-Average Exercise Price	$ 14.85
Options Exercisable at March 31, 2012 \| shares	1,134
Weighted-Average Exercise Price	$ 14.80
$17.19 - $26.83 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	17.19
Range of Exercise Prices, upper range limit	$ 26.83
Options Outstanding March 31, 2012 \| shares	1,402
Weighted-Average Remaining Contractual Life \| yr	8.03
Weighted-Average Exercise Price	$ 24.66
Options Exercisable at March 31, 2012 \| shares	584
Weighted-Average Exercise Price	$ 23.56
$27.02 - $41.55 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	27.02
Range of Exercise Prices, upper range limit	$ 41.55
Options Outstanding March 31, 2012 \| shares	1,360
Weighted-Average Remaining Contractual Life \| yr	9.36
Weighted-Average Exercise Price	$ 39.31
Options Exercisable at March 31, 2012 \| shares	54
Weighted-Average Exercise Price	$ 30.12
$43.30 - $53.81 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	43.30
Range of Exercise Prices, upper range limit	$ 53.81
Options Outstanding March 31, 2012 \| shares	81
Weighted-Average Remaining Contractual Life \| yr	9.82
Weighted-Average Exercise Price	$ 49.76
Options Exercisable at March 31, 2012 \| shares	0
Weighted-Average Exercise Price	$ 0.00
$4.00 - $53.81 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	4.00
Range of Exercise Prices, upper range limit	$ 53.81
Options Outstanding March 31, 2012 \| shares	6,656
Weighted-Average Remaining Contractual Life \| yr	6.22
Weighted-Average Exercise Price	$ 19.19
Options Exercisable at March 31, 2012 \| shares	4,115
Weighted-Average Exercise Price	$ 11.45

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Tax Credit Carryforward [Line Items]
Valuation allowances against deferred tax assets	$ 1,420	$ 4,306
Valuation allowance against research tax credits	1,343
Valuation allowance against foreign net operating loss carryforwards	77
Excess tax benefit related to share-based payments	16,072	7,084
Federal Alternative Minimum Tax credit carryforwards	1,586
Unrecognized tax benefits which would favorably affect the effective tax rate once recognized	4,699	4,481	$ 5,229	$ 4,539
Accrued interest and penalties	784	842
Reasonably possible amount of currently remaining unrecognized tax benefits	404
Reasonably possible amount of currently remaining accrued interest and penalties	201
Interest and penalties	117	$ 152	$ 138
Investments In Foreign Subsidiaries And Foreign Corporate Joint Ventures That Are Essentially Permanent In Duration [Member]
Tax Credit Carryforward [Line Items]
Cumulative unremitted foreign earnings	5,277
New Jersey [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	2,074
Foreign Jurisdictions [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	6,973
Research [Member] \| New Jersey [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	5,155
Research [Member] \| U.S. Federal [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 12,250
Minimum [Member] \| Research [Member] \| New Jersey [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward, expiration dates	2014
Minimum [Member] \| Research [Member] \| U.S. Federal [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward, expiration dates	2022
Maximum [Member] \| Research [Member] \| New Jersey [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward, expiration dates	2027
Maximum [Member] \| Research [Member] \| U.S. Federal [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward, expiration dates	2032

Income Taxes (Schedule Of Components Of Income Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Taxes [Abstract]
Income before income taxes, Domestic	$ 43,526	$ 31,553	$ 29,927
Income before income taxes, Foreign	6,466	4,762	2,200
Income before income taxes	$ 49,992	$ 36,315	$ 32,127

Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Taxes [Abstract]
Current, Federal	$ 18,716	$ 6,311	$ 3,766
Current, State	2,292	1,781	2,124
Current, Foreign	2,037	(579)	1,361
Deferred, Federal	(3,196)	2,883	6,348
Deferred, State	(2,673)	4,501	(91)
Deferred, Foreign	876	414	214
Income tax expense (benefit)	$ 18,052	$ 15,311	$ 13,722

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Paragraph Question 1-7

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) during the period in the entity's domestic deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federally enacted tax law.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 8, 16, 17, 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) in the entity's net foreign deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of applicable enacted tax laws of countries other than the country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) in the entity's state and local deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the applicable enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 8, 16, 17, 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 15, 16, 19
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45, 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e32247-109318

+ Details

Income Taxes (Schedule Of Reconciliation Of The Statutory Tax Rates And The Effective Tax Rates) (Details)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Taxes [Abstract]
Statutory federal income tax expense rate	35.00%	35.00%	35.00%
State and local income tax expense, net of federal income tax effect	2.60%	3.90%	4.40%
Impact of state tax rate change on deferred tax assets	1.00%	0.50%	(0.50%)
Foreign earnings taxed at different rates	1.80%	0.50%	2.30%
Permanent differences	3.00%	1.50%	2.30%
Foreign tax credits	(1.40%)	(1.40%)	3.50%
Research credits	(2.70%)	(5.00%)	(4.10%)
Tax reserves		(4.60%)	1.90%
Change in valuation allowance	(3.20%)	11.90%
Other differences, net		(0.10%)	(2.10%)
Effective income tax expense	36.10%	42.20%	42.70%

Income Taxes (Schedule Of Components Of The Company's Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011
Income Taxes [Abstract]
Tax credits	$ 18,478	$ 18,239
Stock-based compensation	11,832	10,656
Deferred revenue	4,385	3,438
Net operating losses	1,858	2,625
Depreciation and amortization	1,289	1,255
Allowance for doubtful accounts the other reserves	1,049	961
Accrued expenses	1,107	911
Total deferred tax assets	39,998	38,085
Less: valuation allowance	(1,420)	(4,306)
Net deferred tax assets	$ 38,578	$ 33,779

Income Taxes (Schedule Of Tax Years Subject To Income Tax Examination) (Details)	12 Months Ended
	Mar. 31, 2012
U.S. Federal [Member]
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2001 - Present
New Jersey [Member]
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2002 - Present
Foreign Jurisdictions [Member]
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2006 - Present

Income Taxes (Schedule Of Changes In Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Taxes [Abstract]
Beginning Balance	$ 4,481	$ 5,229	$ 4,539
Additions for tax positions related to current fiscal years	582	512	447
Additions for tax positions related to prior years	96	86	127
Settlements
Reductions related to the expiration of statutes of limitations	(390)	(1,447)
Foreign currency translation adjustment	(70)
Foreign currency translation adjustment		101	116
Ending Balance	$ 4,699	$ 4,481	$ 5,229

Employee Benefit Plan (Details) $ in Thousands	12 Months Ended
Employee Benefit Plan (Details) $ in Thousands	Mar. 31, 2012 USD ($)
Employee Benefit Plan [Abstract]
Company contributions to defined contribution plan	$ 265

Segment Information (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Segment Reporting Information [Line Items]
Long-lived assets	$ 13,477	$ 8,033
United States [Member]
Segment Reporting Information [Line Items]
Percentage of revenues below which countries other than the U.S. account for	10.00%	10.00%	10.00%
Long-lived assets	$ 8,131	$ 4,768
Percentage of long-lived assets	10.00%	10.00%
United Kingdom [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 2,872	$ 1,072

Segment Information (Schedule Of Revenue By Geographic Area) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Segment Reporting Information [Line Items]
Revenue	$ 406,639	$ 314,776	$ 271,025
United States [Member]
Segment Reporting Information [Line Items]
Revenue	248,749	190,706	169,343
Other [Member]
Segment Reporting Information [Line Items]
Revenue	$ 157,890	$ 124,070	$ 101,682

Segment Information (Schedule Of Long-Lived Assets By Geographic Area) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Long-lived assets	$ 13,477	$ 8,033
United States [Member]
Segment Reporting Information [Line Items]
Long-lived assets	8,131	4,768
Other [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 5,346	$ 3,265

Selected Quarterly Financial Data (Schedule Of Selected Quarterly Financial Data) (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2010

Sep. 30, 2010

Jun. 30, 2010

Mar. 31, 2012

Mar. 31, 2011

Mar. 31, 2010

Selected Quarterly Financial Data [Abstract]

Total revenue

$ 114,014

$ 103,640

$ 97,458

$ 91,527

$ 89,621

$ 83,629

$ 75,226

$ 66,300

$ 406,639

$ 314,776

$ 271,025

Gross margin

99,334

90,030

84,384

79,484

77,797

73,475

65,709

56,780

353,232

273,761

235,380

Net income

$ 9,842

$ 7,160

$ 7,899

$ 7,039

$ 4,835

$ 7,252

$ 5,419

$ 3,498

$ 31,940

$ 21,004

$ 18,405

Net income per common share, Basic

$ 0.22

^[1]

$ 0.16

^[1]

$ 0.18

^[1]

$ 0.16

^[1]

$ 0.11

^[1]

$ 0.17

^[1]

$ 0.13

^[1]

$ 0.08

^[1]

$ 0.72

$ 0.49

$ 0.44

Net income per common share, Diluted

$ 0.21

^[1]

$ 0.15

^[1]

$ 0.17

^[1]

$ 0.15

^[1]

$ 0.10

^[1]

$ 0.16

^[1]

$ 0.12

^[1]

$ 0.08

^[1]

$ 0.68

$ 0.45

$ 0.41

[1]	Per common share amounts for the quarters and full year have been calculated separately. Accordingly, quarterly amounts do not add to the annual amount because of differences in the weighted average common shares outstanding during each period used in the basic and diluted calculations.

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

+ Details

- Definition

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 106	$ 292	$ 193
Charged (Credited) to Costs and Expenses	(2)	(42)	158
Deductions	7	144	59
Balance at End of Year	97	106	$ 292
Valuation Allowance For Deferred Taxes [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	4,306
Charged (Credited) to Costs and Expenses	(2,886)	4,306
Balance at End of Year	$ 1,420	$ 4,306