Income Statement [Abstract] Revenues: Sales Revenue, Services, Net [Abstract] Software Licenses Revenue Services Services Revenue Services Revenue derived from customer support revenue and other professional services. Customer support includes software updates on a when-and-if-available basis, telephone support and bug fixes or patches. Other Professional Services include consulting, assessment design services and installation services and training. Total revenues Revenues Cost of revenues: Cost of Services [Abstract] Software License Costs Services Cost Of Service Revenue Cost of generating revenue derived from customer support revenue and other professional services. Customer support includes software updates on a when and if available basis, telephone support and bug fixes or patches. Other Professional Services include consulting, assessment design services and installation services and training. Total cost of revenues Cost of Revenue Gross margin Gross Profit Operating expenses: Operating Expenses [Abstract] Sales and marketing Selling and Marketing Expense Research and development Research and Development Expense General and administrative General and Administrative Expense Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Total operating expenses Operating Expenses Loss from operations Operating Income (Loss) Interest expense Interest and Debt Expense Interest income Investment Income, Interest Equity in income (loss) of affiliate Income (Loss) from Equity Method Investments Loss before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax benefit Income Tax Expense (Benefit) Net loss Net Income (Loss) Attributable to Parent Net loss per common share: Earnings Per Share [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Revenue from Contract with Customer [Abstract] Revenue Revenue from Contract with Customer [Text Block] Accounting Policies [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] As Reported Calculated under Revenue Guidance in Effect before Topic 606 [Member] Adjustments Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2014-09 Accounting Standards Update 2014-09 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Trade accounts receivable Accounts Receivable, Net, Current Total current assets Assets, Current Deferred tax assets, net Deferred Income Tax Assets, Net Deferred commissions Deferred Sales Commission Total assets Assets Deferred revenue Deferred Revenue, Current Total current liabilities Liabilities, Current Other liabilities Other Liabilities, Noncurrent Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted stock units Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Weighted average fair value, units awarded (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Statement of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Noncash stock-based compensation Share-based Compensation Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Deferred income taxes Deferred Income Tax Expense (Benefit) Equity in income (loss) of affiliate Amortization of deferred commissions cost Amortization of Deferred Sales Commissions Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Trade accounts receivable Increase (Decrease) in Accounts Receivable Other current assets and Other assets Increase (Decrease) in Other Operating Assets Deferred commissions cost Increase (Decrease) In Deferred Sales Commissions Increase (Decrease) in Deferred Sales Commissions Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Purchase of short-term investments Payments to Acquire Short-term Investments Proceeds from maturity of short-term investments Proceeds from Sale of Short-term Investments Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from stock-based compensation plans Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Excess tax benefits from stock-based compensation (see Note 2) Excess Tax Benefit from Share-based Compensation, Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Effects of exchange rate — changes in cash Effect of Exchange Rate on Cash and Cash Equivalents Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Sources of primary revenue Sources Of Primary Revenue The number of sources of revenue in a typical sales agreement. Customer support agreement term Customer Support Agreement The typical length of Customer Support Agreements. Number of operating segments Number of Operating Segments Revenue recognized in period, included in opening deferred revenue balance Contract with Customer, Liability, Revenue Recognized Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Software Revenue Software [Member] Software [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue expected to be recognized from remaining performance obligations Revenue, Remaining Performance Obligation Stock-Based Compensation Expense Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of Stock Option Activity Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Restricted Stock Unit Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Realtime Realtime Data LLC dba IXO [Member] Realtime Data LLC dba IXO [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of patents involved in alleged infringement Loss Contingency, Patents Allegedly Infringed, Number Deferred Revenue Arrangement, by Type [Table] Deferred Revenue Arrangement, by Type [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Deferred revenue Deferred Revenue, Current [Member] Deferred Revenue, Current [Member] Deferred revenue, less current portion Deferred Revenue, Noncurrent [Member] Deferred Revenue, Noncurrent [Member] Deferred Revenue Arrangement [Line Items] Deferred Revenue Arrangement [Line Items] Deferred Revenue (current) [Roll Forward] Contract With Customer, Liability, Current [Roll Forward] Contract with Customer, Liability, Current [Roll Forward] Opening Balance as of March 31, 2017 Contract with Customer, Liability, Current Increase/decrease, net Contract With Customer, Liability, Current, Increase (Decrease) Contract With Customer, Liability, Current, Increase (Decrease) Ending Balance as of June 30, 2017 Contract With Customer, Liability, Noncurrent [Roll Forward] Contract With Customer, Liability, Noncurrent [Roll Forward] Contract With Customer, Liability, Noncurrent [Roll Forward] Opening Balance as of March 31, 2017 Contract with Customer, Liability, Noncurrent Increase/decrease, net Contract With Customer, Liability, Noncurrent, Increase (Decrease) Contract With Customer, Liability, Noncurrent, Increase (Decrease) Ending Balance as of June 30, 2017 Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Arrow Arrow [Member] Arrow [Member] Avnet Avnet [Member] Avnet [Member] HDS Hitachi Data Systems [Member] Hitachi Data Systems [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue Sales Revenue, Net [Member] Accounts receivable Accounts Receivable [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration risk percentage Concentration Risk, Percentage Statement of Financial Position [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Property, Plant and Equipment [Abstract] Depreciation and amortization expense Depreciation Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Short-term investments Held-to-maturity Securities, Fair Value Net Income per Common Share Earnings Per Share [Text Block] Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Common stock repurchase program Common Stock Repurchase Program [Member] Common Stock Repurchase Program [Member] Class of Stock [Line Items] Class of Stock [Line Items] Repurchase of common stock Stock Repurchased During Period, Value Remaining value of common stock to be repurchased under share repurchase program Stock Repurchase Program, Remaining Authorized Repurchase Amount Revenue from Contract with Customer Financial Statement Impact Revenue From Contract With Customer Financial Statement Impact [Table Text Block] Revenue From Contract With Customer Financial Statement Impact [Table Text Block] Financial Assets Measured at Fair Value Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Accounting Standards Update 2016-09 Accounting Standards Update 2016-09 [Member] Excess tax benefits Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Decrease to net loss Decrease to earnings per share, basic (in dollars per share) Decrease to earnings per share, diluted (in dollars per share) Total cost of revenues Total operating expenses Equity in loss of affiliate Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Stock Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Document And Entity Information [Abstract] Document and Entity Information Abstract. Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Debt Disclosure [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving credit facility Revolving Credit Facility [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR rate London Interbank Offered Rate (LIBOR) [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Debt term Debt Instrument, Term Borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Variable rate Debt Instrument, Basis Spread on Variable Rate Unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Borrowings under the Credit Facility Long-term Line of Credit Unamortized debt issuance costs Unamortized Debt Issuance Expense Amortization of debt issuance costs Amortization of Debt Issuance Costs Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance as of March 31, 2017 Unrecognized Tax Benefits Additions for tax positions related to fiscal 2017 Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Additions for tax positions related to prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Settlements and effective settlements with tax authorities and remeasurements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Reductions related to the expiration of statutes of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Foreign currency translation adjustment Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation Balance as of June 30, 2017 Professional Services, other Professional Services, Other [Member] Professional Services, Other [Member] Professional Services, education services Professional Services, Education Services [Member] Professional Services, Education Services [Member] Performance obligation, expected payment terms Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Antidilutive securities excluded from computation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Total intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Trade and Other Receivables Trade and Other Accounts Receivable, Unbilled Receivables, Policy [Policy Text Block] Sales Tax Revenue, Transaction Price Measurement, Tax Exclusion [Policy Text Block] Shipping and Handling Cost Shipping and Handling Cost, Policy [Policy Text Block] Deferred Commissions Cost Revenue Recognition, Services, Commissions [Policy Text Block] Deferred Revenue Revenue Recognition, Deferred Revenue [Policy Text Block] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Short-term investments Held-to-maturity Securities, Current Trade accounts receivable Receivables, Net, Current Other current assets Other Assets, Current Property and equipment, net Property, Plant and Equipment, Net Equity method investment Equity Method Investments Deferred commissions cost Other assets Other Assets, Noncurrent LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Deferred revenue, less current portion Deferred Revenue, Noncurrent Commitments and contingencies Commitments and Contingencies Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value: 50,000 shares authorized, no shares issued and outstanding at June 30, 2017 and March 31, 2017 Preferred Stock, Value, Issued Common stock, $0.01 par value: 250,000 shares authorized, 45,354 shares and 44,816 shares issued and outstanding at June 30, 2017 and March 31, 2017, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Number of Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding (in shares) as of March 31, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Outstanding (in shares) as of June 30, 2017 Exercisable (in shares) as of June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted- Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding (in dollars per share) as of March 31, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Options exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Options forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Options expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Outstanding (in dollars per share) as of June 30, 2017 Exercisable (in dollars per share) as of June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Weighted Average Remaining Contractual Term [Abstract] Share based Compensation Arrangement by Share based Payment Award, Other than Options, Weighted Average Remaining Contractual Term [Abstract] Outstanding (in years) as of June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Exercisable (in years) as of June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Outstanding as of June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Exercisable as of June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Revolving Credit Facility Debt Disclosure [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Customer Support Revenue Customer Support [Member] Customer Support [Member] Professional Services Professional Services [Member] Professional Services [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Americas Americas [Member] EMEA EMEA [Member] APAC Asia Pacific [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total Revenue Revenue from Contract with Customer, Excluding Assessed Tax Reconciliation of Amounts of Unrecognized Tax Benefits Summary of Income Tax Contingencies [Table Text Block] Number of Awards Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Non-vested (in shares) as of March 31, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Awarded (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Non-vested (in shares) as of June 30, 2017 Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Non-vested (in dollars per share) as of March 31, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Awarded (in dollars per share) Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Non-vested (in dollars per share) as of June 30, 2017 Capitalization Capitalization [Text Block] Entities disclosure for capitalization. Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Income tax benefit Income tax reconciliation, impact of excess tax benefits for exercised stock options and vested restricted stock units Reconciliation Of Unrecognized Tax Benefits [Table] Reconciliation Of Unrecognized Tax Benefits [Table] Reconciliation of Unrecognized Tax Benefits [Table] Other liabilities Other Liabilities [Member] Deferred tax assets Deferred Tax Assets [Member] Deferred Tax Assets [Member] Reconciliation Of Unrecognized Tax Benefits [Line Items] Reconciliation Of Unrecognized Tax Benefits [Line Items] Reconciliation of Unrecognized Tax Benefits [Line Items] Unrecognized tax benefits Unrecognized tax benefits accrued interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Director Director [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Director on Company's board of directors hired as CEO of Rackspace, Inc. Transaction With Customer, A Director Of Company's Board Hired As Customer's Chief Executive Officer [Member] Transaction With Customer, A Director Of Company's Board Of Directors Hired As Customer's Chief Executive Officer [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Revenue from related party Revenue from Related Parties Accounts receivable from related party Accounts Receivable, Related Parties Deferred commissions cost, period of benefit Amortization Period Of Deferred Sales Commissions Amortization Period Of Deferred Sales Commissions Performance stock options Performance Stock Options [Member] Performance Stock Options [Member] Performance restricted stock units Performance Restricted Stock Units [Member] Performance Restricted Stock Units [Member] Number of annual tranches Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Annual Tranches Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Annual Tranches Maximum potential to vest (as a percentage) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Maximum Potential To Vest Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Maximum Potential To Vest Maximum potential to vest (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Maximum Number Of Shares To Vest Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Maximum Number Of Shares To Vest Service period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid – In Capital Additional Paid-in Capital [Member] Accumulated Deficit Retained Earnings [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (in shares) Shares, Outstanding Beginning balance Cumulative Effect of Adoption of ASU 2016-09 Cumulative Effect of New Accounting Principle in Period of Adoption Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share issuances related to stock-based compensation (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Share issuances related to stock-based compensation Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Other comprehensive income Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Ending balance (in shares) Ending balance Property and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of services revenue Cost Of Services Revenue [Member] Cost of services revenue Member. Sales and marketing Selling and Marketing Expense [Member] Research and development Research and Development Expense [Member] General and administrative General and Administrative Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Stock-based compensation expense Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Contract with Customer, Asset and Liability Contract with Customer, Asset and Liability [Table Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2016 Incentive Plan 2016 Incentive Plan [Member] 2016 Incentive Plan [Member] Stock options and restricted stock units Stock Options and Restricted Stock Units [Member] Stock Options and Restricted Stock Units [Member] Maximum number of shares of common stock that may be delivered under plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Unrecognized stock-based compensation expense, net of estimated forfeitures Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted average period awards are expected to be recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land Land [Member] Buildings Building [Member] Computers, servers and other equipment Computer Equipment [Member] Furniture and fixtures Furniture and Fixtures [Member] Leasehold improvements Leasehold Improvements [Member] Purchased software Computer Software, Intangible Asset [Member] Construction in process Construction in Progress [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment, gross Property, Plant and Equipment, Gross Less: Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Purchase plan Employee Stock [Member] Stock purchase price (as a percentage) Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Offering period Share-based Compensation Arrangement by Share-based Payment Award, Offering Period Share-based Compensation Arrangement by Share-based Payment Award, Offering Period Maximum employee subscription rate (as a percentage) Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Maximum annual purchases per employee Share-based Compensation Arrangement by Share-based Payment Award, Maximum Annual Purchases Per Employee, Amount Share-based Compensation Arrangement by Share-based Payment Award, Maximum Annual Purchases Per Employee, Amount Number of shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Compensation expense Allocated Share-based Compensation Expense Statement of Comprehensive Income [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustment Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Trade accounts receivable Trade Accounts Receivable [Member] Other assets Other Assets [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts Receivable [Roll Forward] Accounts Receivable [Roll Forward] Accounts Receivable [Roll Forward] Opening Balance as of March 31, 2017 Accounts Receivable, Net Increase/decrease, net Ending Balance as of June 30, 2017 Unbilled Receivable (current) [Roll Forward] Contract With Customer, Asset, Net, Current [Roll Forward] Contract With Customer, Asset, Net, Current [Roll Forward] Opening Balance as of March 31, 2017 Contract with Customer, Asset, Net, Current Increase/decrease, net Contract With Customer, Asset, Net, Current, Increase (Decrease) Contract With Customer, Asset, Net, Current, Increase (Decrease) Ending Balance as of June 30, 2017 Unbilled Receivable (long-term) [Roll Forward] Contract With Customer, Asset, Net, Noncurrent [Roll Forward] Contract With Customer, Asset, Net, Noncurrent [Roll Forward] Opening Balance as of March 31, 2017 Contract with Customer, Asset, Net, Noncurrent Increase/decrease, net Contract With Customer, Asset, Net, Noncurrent, Increase (Decrease) Contract With Customer, Asset, Net, Noncurrent, Increase (Decrease) Ending Balance as of June 30, 2017