Finite-Lived Intangible Assets by Major Class [Axis] Technology Customer relationships Trade names/domains Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Cost of service revenue Cost of product revenue Research and development Sales and marketing General and administrative Fair Value, Hierarchy [Axis] Level 1 Level 2 Geographical [Axis] Americas Europe Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Option Grants Investment Type [Axis] Cash Money Market Funds Commercial Paper Municipal Securities Asset-backed Securities Agency Bond International Government Securities Corporate Debt Consolidation Items [Axis] Americas Europe In-process research and development Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Stock options Stock awards Stock Awards Product and Service [Axis] Service Product Business Combination, Separately Recognized Transactions [Axis] MarianaIQ Subsegments [Axis] Contracts with Customers Adjustments for New Accounting Pronouncements [Axis] ASC 605 Initial Application Period Cumulative Effect Transition [Axis] Previous ASC 606 Adjustment ASC 605 Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Is Entity a Well-known Seasoned Issuer? Is Entity a Voluntary Filer? Is Entity's Reporting Status Current? Entity Filer Category Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus Condensed Consolidated Balance Sheets ASSETS Current assets: Cash and cash equivalents Short-term investments Accounts receivable, net Deferred sales commission costs Other current assets Total current assets Property and equipment, net Intangible assets, net Goodwill Restricted cash Deferred sales commission costs, noncurrent Other assets Total assets LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities: Accounts payable Accrued compensation Accrued taxes Deferred revenue Other accrued liabilities Total current liabilities Non-current liabilities Total liabilities Commitments and contingencies (Note 6) Stockholders' equity: Common stock Additional paid-in capital Accumulated other comprehensive loss Accumulated deficit Total stockholders' equity Total liabilities and stockholders' equity Statement [Table] Statement [Line Items] Revenue from Contract with Customer, Including Assessed Tax Revenues Operating expenses: Cost of Goods and Services Sold Research and development Sales and marketing General and administrative Total operating expenses Loss from operations Other income, net Loss before provision (benefit) for income taxes Provision (benefit) for income taxes Net loss Net loss per share: Basic Diluted Weighted average number of shares: Basic Diluted Statement of Comprehensive Income [Abstract] Net loss Other comprehensive income (loss), net of tax Unrealized gain on investments in securities Foreign currency translation adjustment Comprehensive loss Condensed Consolidated Statements Of Cash Flows Cash flows from operating activities: Adjustments to reconcile net loss to net cash provided by operating activites: Depreciation Amortization of intangible assets Amortization of capitalized software Non-cash lease expenses Stock-based compensation Deferred income tax benefit Gain on escrow settlement Other Changes in assets and liabilities: Accounts receivable, net Deferred sales commission costs Other current and noncurrent assets Accounts payable and accruals Deferred revenue Net cash provided by operating activities Cash flows from investing activities: Purchases of property and equipment Purchase of business Proceeds from escrow settlement Cost of capitalized software Proceeds from maturity of investments Sales of investments - available for sale Purchase of investments - available for sale Net cash provided by investing activities Cash flows from financing activities: Capital lease payments Payment of contingent consideration and escrow Repurchase and withholding of common stock Proceeds from issuance of common stock under employee stock plans Net cash (used in) provided by financing activities Effect of exchange rate changes on cash Net increase (decrease) in cash and cash equivalents Cash, cash equivalents, and restricted cash at the beginning of the period Cash, cash equivalents, and restricted cash at the end of the period Supplemental cash flow information Income taxes paid Interest paid Property and equipment acquired under capital leases Notes to Financial Statements DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Note 1 Accounting Policies [Abstract] REVENUE RECOGNITION - Note 2 Cash and Cash Equivalents [Abstract] FAIR VALUE MEASUREMENTS - Note 3 Goodwill and Intangible Assets Disclosure [Abstract] INTANGIBLE ASSETS - Note 4 GOODWILL - Note 5 COMMITMENTS AND CONTINGENCIES - Note 6 Equity [Abstract] STOCK-BASED COMPENSATION - Note 7 INCOME TAXES - Note 8 NET INCOME (LOSS) PER SHARE - Note 9 Segment Reporting [Abstract] SEGMENT REPORTING - Note 10 Business Combinations [Abstract] ACQUISITIONS - Note 11 Fiscal Period Use of Estimates Basis of Presentation Reclassification Acquisition Principles of Consolidation Recently Adopted Accounting Pronouncements Recent Accounting Pronouncements Revenue recognition Research, Development and Software Costs Warranty Expense Indemnifications Segment Reporting Revenue Recognition Tables Schedule of impacts of adopting ASC 606 Schedule of contract assets and liabilities Contracts Fair Value Measurements Tables Fair Value Measurements, Recurring and Nonrecurring (Tables) Intangible Assets Tables Carrying values of intangible assets Finite-lived intangible assets - future amortization expense Goodwill Tables Carrying amounts of goodwill Commitments And Contingencies Tables Future minimum annual operating lease payments Distribution Of Stock-based Compensation Plan Expense Tables Schedule Of Stock-Based Compensation Expense By Statement Of Operations Line Item Award Type [Axis] Stock Purchase Rights Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions Net Income Loss Per Share Tables Net Income (Loss) Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Segment Information Tables Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas Schedule of Segment Reporting Information, by Segment Acquisition Tables Schedule of Business Acquisitions, by Acquisition [Table Text Block] Description Of Business Narrative Details Fiscal Year End Date Assets, net of accumulated amortization reclassified Net captialized software development costs Description Of Business Acquisitions Narrative Details Effective date of purchase agreement Business Acquisition, Description of Acquired Entity Service revenue Product revenue Total revenue Loss from operations Basic and diluted Deferred sales commission costs Other current assets Non-current assets: Deferred sales commission costs Accumulated deficit Cash Flow Line Items Other current and noncurrent assets Net cash provided by operating activities Accounts receivable Other current assets Deferred revenue - current Deferred revenue - noncurrent Contractors [Abstract] Change in other current assets Deferred revenue Change in deferred revenue Revenue Recognition - Estimated Revenue Expected To Be Recognized In Future Related To Performance Obligations Details Revenue, Remaining Performance Obligation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Mutual Funds Mortgage backed Securities Contingent Consideration Fair Value Hierarchy and NAV [Axis] Level 3 Amortized Costs Gross Unrealized Gains Gross Unrealized Loss Estimated Fair Value Short-term marketable investments Long-term marketable investments Liabilities, Fair Value Disclosure Aavailable-for-sale investments due within one year Aavailable-for-sale investments due after one year Gross Carrying Amount Accumulated Amortization Net Carrying Amount Intangible Assets Schedule Of Future Amortization Of Intangibles Details Remaining 2019 2020 2021 2022 2023 Thereafter Total Goodwill, beginning balance Additions due to acquisitions Transfer from subsidiary Foreign currency translation Goodwill, ending balance Commitments And Contingencies Operating Leases Details Year ending March 31: Remaining 2019 2020 2021 2022 2023 Thereafter Total Commitments And Contingencies Operating Leases Narrative Details Rent expense Income Statement Location [Axis] Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax Tax benefit Stock-based employee compensation expense related to employee stock options and employee stock purchases, net of tax Stock-based Compensation Option Activity Details Balance at beginning of period Granted Exercised Cancelled/forfeited Balance at end of period Options, Vested and expected to vest Options, Exercisable at end of period Weighted-average exercise price of options outstanding, at beginning of period Weighted-average exercise price of options granted during period Weighted-average exercise price of options exercised during the period Weighted-average exercise price of options forfeited, cancelled or expired during the period Weighted-average exercise price of options outstanding at end of period Options, Vested and Expected to Vest, Weighted Average Exercise Price Weighted-Average Exercise Prices, Exercisable at end of period Total intrinsic value of options exercised during the period Weighted Average Remaining recognition period in years Stock-based Compensation Stock Awards Activity Details Balance at beginning of period Granted Vested Canceled and forfeited Balance at end of period Weighted-average grant date fair market value, beginning balance Weighted-average grant date fair market value of restricted stock rights granted Weighted-average grant date fair market value, vested during period Weighted-average grant date fair market value, forfeited during period Weighted-average grant date fair market value, ending balance Weighted-average remaining contractual term, in years, ending balance Stock-based Compensation Narrative Details Total unrecognized compensation expense related to stock awards Weighted average period of recognition for unrecognized compensation costs (in years) Stock Repurchases 2017 Narrative Details Stock repurchased and retired during period, shares Stock repurchased and retired during period, value Stock repurchased, weighted average price per share Stock repurchase program, authorized amount Stock repurchase program, remaining authorized repurchase amount Stock repurchase program expiration date Income Tax Authority [Axis] Federal State Foreign Effective Income Tax Rate, Percent U.S. federal statutory rate Unrecognized tax benefits Tax years open for examination Net Income Loss Per Share Details Numerator: Net loss available to common stockholders Denominator: Common shares - basic and diluted Antidilutive Securities [Axis] Anti-dilutive shares Asia-Pacific Geographic Areas, Revenue from External Customers Number of customers at more than 10% of revenue Net revenue Depreciation and amortization expense Net income (loss) Intersegment revenues eliminated in consolidation Total assets Property and equipments, net Assets acquired: Cash Current assets Property and equipment Intangible assets Current and non-current liabilities Goodwill Net identifiable assets acquired Total consideration transferred Purchase price components Cash Contingent payments Fair value of shares of stock issued Total purchase price Business Acquisition, Name of Acquired Entity Business Combination, Assets and Liabilities, Description Expense charged to cost of product revenue. Expense charged to cost of service revenue. Securities issued by municipal governments Amount of increase (decrease) in current contract assets, net Operating Segments [Member] Reportable Geographical Components [Member] ACS605Member Assets, Current Liabilities, Current Liabilities Stockholders' Equity Attributable to Parent Liabilities and Equity Research and Development Expense Selling and Marketing Expense General and Administrative Expense Operating Expenses Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Diluted Comprehensive Income (Loss), Net of Tax, Attributable to Parent Other Noncash Income Increase (Decrease) in Accounts Receivable Increase (Decrease) in Deferred Charges Increase (Decrease) in Other Operating Assets Increase (Decrease) in Deferred Revenue Payments to Acquire Property, Plant, and Equipment Payments to Acquire Businesses, Net of Cash Acquired Payments for Software Payments to Acquire Marketable Securities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Repayments of Long-term Capital Lease Obligations Repayments of Other Debt Payments for Repurchase of Common Stock Net Cash Provided by (Used in) Financing Activities, Continuing Operations Cash and Cash Equivalents, Period Increase (Decrease) Restricted Cash and Cash Equivalents, Current DeferredSalesCommissionCostsCurrent CertainOtherCurrentAssets DeferredSalesCommissionCostsNoncurrent Retained Earnings, Unappropriated Contract with Customer, Asset, Net, Current Deferred Revenue Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Net Other Intangible Assets, Net Goodwill, Foreign Currency Translation Gain (Loss) Operating Leases, Future Minimum Payments Due, Next Twelve Months Operating Leases, Future Minimum Payments, Due in Two Years Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments, Due Thereafter Operating Leases, Future Minimum Payments Due Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Payments to Acquire Businesses, Gross Business Combination, Consideration Transferred