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[Member] Marketing and sales Selling and Marketing Expense [Member] Research and development Research and Development Expense [Member] General and administrative General and Administrative Expense [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Total net revenue Cost of revenue Cost of Goods and Services Sold Marketing and sales Selling and Marketing Expense Research and development Research and Development Expense General and administrative General and Administrative Expense Amount of gain (loss) reclassified from accumulated other comprehensive income into income Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Common stock and additional paid-in capital Common Stock Including Additional Paid in Capital [Member] Accumulated deficit Retained Earnings [Member] Class of Stock [Line Items] Class of Stock [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (shares) Common Stock, Shares, Outstanding Common shares issued under stock plans (shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Common shares issued under stock plans Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Stock-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Purchase price accounting adjustment Adjustments To Additional Paid In Capital, Acquisitions, Purchase Accounting Adjustment Adjustments To Additional Paid In Capital, Acquisitions, Purchase Accounting Adjustment Post-combination expense related to equity awards assumed Post Combination Expense Post Combination Expense Cumulative effect of accounting changes Cumulative Effect of New Accounting Principle in Period of Adoption Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Shares issued for acquisition (shares) Stock Issued During Period, Shares, Acquisitions Shares issued for acquisition Stock Issued During Period, Value, Acquisitions Repurchase and retirement of common shares (shares) Stock Repurchased and Retired During Period, Shares Repurchase and retirement of common shares Stock Repurchased and Retired During Period, Value Ending balance (shares) Computer Equipment, Software, Furniture and Leasehold Improvements, Net Property, Plant and Equipment Disclosure [Text Block] Schedule of stock options roll forward Schedule of Stock Options Roll Forward [Table Text Block] Intrinsic value of options exercised Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] Schedule of summary of restricted stock activity Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Schedule of summary of the ESPP activity Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Schedule of stock-based compensation expense Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Schedule of assumptions to estimate the fair value of stock-based awards Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Share-based Compensation Award, Tranche One Share-based Payment Arrangement, Tranche One [Member] Share-based Compensation Award, Tranche Two Share-based Payment Arrangement, Tranche Two [Member] Share-based Compensation Award, Tranche Three Share-based Payment Arrangement, Tranche Three [Member] Restricted Stock Units (RSUs) and Performance Shares Restricted Stock Units (RSUs) and Performance Shares [Member] Restricted Stock Units (RSUs) and Performance Shares [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Compensation cost related to non-vested stock options Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Compensation cost related to non-vested stock options, weighted average period of recognition Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Awards vested in period, fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Awards granted in period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Allocated share-based compensation expense Share-based Payment Arrangement, Expense Market capitalization Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility, Market Capitalization Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility, Market Capitalization Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period PSU annual vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Employee stock purchase plan maximum percentage of compensation to purchase shares by eligible participants Employee Stock Purchase Plan Maximum Percentage Of Compensation To Purchase Shares By Eligible Participants Employee Stock Purchase Plan, Maximum Percentage of Compensation to Purchase Shares By Eligible Participants Employee stock purchase plan minimum percentage of common stock fair value defined to purchase shares by eligible participants Employee Stock Purchase Plan Minimum Percentage Of Common Stock Fair Value Defined To Purchase Shares By Eligible Participants Employee Stock Purchase Plan, Minimum Percentage of Common Stock Fair Value Defined to Purchase Shares By Eligible Participants Employee stock purchase plan, number of exercise periods Employee Stock Purchase Plan, Number of Exercise Periods Employee Stock Purchase Plan, Number of Exercise Periods Employee stock purchase plan, term of exercise period Employee Stock Purchase Plan, Term of Exercise Period Employee Stock Purchase Plan, Term of Exercise Period Employee stock purchase plan, term of offering period Employee Stock Purchase Plan, Term of Offering Period Employee Stock Purchase Plan, Term of Offering Period Expected dividend yield (in percentage) Income Tax Income Tax Disclosure [Text Block] 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 Common stock repurchased and retired (in shares) Stock Repurchased During Period, Shares Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share) Treasury Stock Acquired, Average Cost Per Share Common stock shares remained available for repurchase under repurchase plans (in shares) Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Segments Segment Reporting Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Remaining lease term (in years) Lessee, Operating Lease, Remaining Lease Term Lessee, Operating Lease, Remaining Lease Term Lease renewal term (in years) Lessee, Operating Lease, Renewal Term Optional termination period (in years) Lessee, Operating Lease, Termination Period Lessee, Operating Lease, Termination Period Variable lease payments Variable Lease, Payment Weighted average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate (in percentage) Operating Lease, Weighted Average Discount Rate, Percent Operating lease minimum payments, executed leases that have not commenced Lessee, Operating Lease, Lease Not yet Commenced, Undiscounted Amount Lessee, Operating Lease, Lease Not yet Commenced, Undiscounted Amount Rent expense Operating Leases, Rent Expense Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Contract with customer, liability, revenue recognized Contract with Customer, Liability, Revenue Recognized Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Remaining performance obligation percentage Revenue, Remaining Performance Obligation, Percentage Performance obligation, expected timing of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Statement of Comprehensive Income [Abstract] Net income (loss) Other comprehensive income (loss), net of reclassifications: Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent [Abstract] Net (loss) gain on derivative instruments (net of tax effect of ($1.7), ($1.1), ($2.0) and ($1.8), respectively) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Net (loss) gain on derivative instruments (net of tax effect of ($1.7), ($1.1), ($2.0) and ($1.8), respectively) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent Change in net unrealized (loss) gain on available-for-sale debt securities (net of tax effect of $0.1, ($0.1), ($0.3) and $0.0, respectively) Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Change in defined benefit pension items (net of tax effect of $0.4, ($0.1), $0.5 and ($1.5), respectively) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Net change in cumulative foreign currency translation loss (net of tax effect of ($0.4), $0.2, $0.0 and $0.5, respectively) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual and by Type of Deferred Compensation [Table] Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual and by Type of Deferred Compensation [Table] Fair Value, Assets and Liabilities Measured on a Recurring Basis [Axis] Fair Value, Assets and Liabilities Measured on a Recurring Basis [Axis] Fair Value, Assets and Liabilities Measured on a Recurring Basis Axis Fair Value, Assets and Liabilities Measured on a Recurring Basis [Domain] Fair Value, Assets and Liabilities Measured on a Recurring Basis [Domain] Fair Value, Assets and Liabilities Measured on a Recurring Basis [Domain] Rabbi Trust Rabbi Trust Member Rabbi Trust Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] Marketable securities Marketable Securities Deferred compensation liability Deferred Compensation Liability, Current and Noncurrent Deferred compensation liability, current Deferred Compensation Liability, Current Deferred compensation liability, non-current Deferred Compensation Liability, Classified, Noncurrent Costs to obtain a contract Capitalized Contract Cost, Net Amortization of costs to obtain a contract Capitalized Contract Cost, Amortization Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Income Statement [Abstract] Statement [Table] Statement [Table] Other Product and Service, Other [Member] Statement [Line Items] Statement [Line Items] Net revenue: Revenues [Abstract] Cost of revenue: Cost of Revenue [Abstract] Amortization of developed technology Cost, Amortization Total cost of revenue Cost of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Amortization of purchased intangibles Amortization of Intangible Assets Restructuring and other exit costs, net Restructuring Charges, Net of Adjustments Restructuring Charges, Net of Adjustments Total operating expenses Operating Expenses Income (loss) from operations Operating Income (Loss) Interest and other (expense) income, net Interest Income (Expense), Net Income (loss) before income taxes Provision for income taxes Net income (loss) Weighted average shares used in computing basic net income (loss) per share (shares) Weighted average shares used in computing diluted net income (loss) per share (shares) Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Income Statement Location [Axis] Income Statement Location [Domain] Cost of subscription and maintenance revenue Cost of Goods Sold, Subscription [Member] Cost of Goods Sold, Subscription [Member] Cost of other revenue License Costs [Member] License Costs [Member] Marketing and sales Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Stock-based compensation expense related to stock awards and ESPP purchases Tax benefit Share-based Payment Arrangement, Expense, Tax Benefit Stock-based compensation expense related to stock awards and ESPP purchases, net of tax Share-based Payment Arrangement, Expense, after Tax Goodwill Goodwill Disclosure [Text Block] Pre-tax intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Employee Stock Employee Stock [Member] Issued shares (shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Average price of issued shares (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Shares Issued Average Price Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued, Average Price Weighed average grant date fair value of awards granted under the ESPP (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Stockholders' Deficit Stockholders' Equity Note Disclosure [Text Block] Schedule of computation of the numerators and denominators used in the basic and diluted net loss per share amounts Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Leases Lessee, Operating Leases [Text Block] Unvested restricted stock units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Unvested restricted stock units, beginning balance (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (shares) Vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Canceled/Forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Performance adjustment (shares) Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Adjustments In Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Adjustment In Period Unvested restricted stock units, ending balance (shares) Weighted average grant date fair value per share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Roll Forward] Unvested restricted stock units, beginning balance (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in usd 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 Vested (in usd 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 Canceled/Forfeited (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Performance adjustment (in usd per share) Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Adjustments, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Adjustment, Weighted Average Grant Date Fair Value Unvested restricted stock units, ending balance (in usd per share) Performance shares units payout (in percentage) Performance Shares, Units, Payout Percentage Performance Shares, Units, Payout Percentage Lease Cost and Cash Flow Information Lease, Cost [Table Text Block] Future Minimum Lease Payments Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of changes in stockholders' deficit by component, net of tax Schedule of Stockholders Equity [Table Text Block] Other Intangible Assets, Net Intangible Assets Disclosure [Text Block] Cost of other revenue Cost of Other Revenue [Domain] Cost of Other Revenue [Domain] Operating lease cost Operating Lease, Cost Variable lease cost Variable Lease, Cost Cash paid for operating leases included in operating cash flows Operating Lease, Payments Non-cash operating lease liabilities arising from obtaining operating lease right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Borrowing Arrangements Debt Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Cover page. Document Type Document Type Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Net gain on derivative instruments, tax effect Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Net gain on derivative instruments, tax effect Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Change in net unrealized gain on available-for-sale debt securities, tax effect Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax Change in defined benefit pension items, tax effect Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Net change in cumulative foreign currency translation loss, tax effect Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax