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Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Net tangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Excluding Intangible Assets And Deferrals Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Excluding Intangible Assets And Deferrals Total Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Deferred Compensation Arrangements [Abstract] Deferred Compensation Compensation Related Costs, General [Text Block] Borrowing Arrangements Debt Disclosure [Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs Schedule of Employee Service Share-based 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Other Assets, Current Total current assets Assets, Current Marketable securities Marketable Securities, Noncurrent Computer equipment, software, furniture and leasehold improvements, net Developed technologies, net Intangible Assets, Net (Excluding Goodwill) Goodwill Deferred income taxes, net Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued compensation Employee-related Liabilities, Current Deferred revenue Deferred Revenue, Current Other accrued liabilities Other Accrued Liabilities, Current Total current liabilities Liabilities, Current Long-term deferred revenue Deferred Revenue, Noncurrent Long-term deferred income taxes Long-term notes payable, net Long-term Debt Other liabilities Other Liabilities, Noncurrent Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock Preferred Stock, Value, Issued Common stock and additional paid-in capital Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity 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 Member 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 Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Derivative Instrument Risk [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Net revenue Sales [Member] Operating expenses Operating Expense [Member] Interest and other expense, net Interest and other income (expense), net [member] Interest Income (Expense), Net Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Amount of gain (loss) recognized in accumulated other comprehensive income on derivatives (effective portion) Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Amount and location of gain (loss) reclassified from accumulated other comprehensive income into income (effective portion) Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Amount and location of loss recognized in income on derivatives (ineffective portion and amount excluded from effectiveness testing) Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Amount and location of loss recognized in income on derivatives Derivative, Gain (Loss) on Derivative, Net Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Exercise Price Higher than Average Market Value Exercise Price Higher than Average Market Value [Member] Exercise Price Higher than Average Market Value [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Denominator for basic net loss per share—weighted average shares (shares) Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities (shares) Weighted Average Number Diluted Shares Outstanding Adjustment Denominator for dilutive net loss per share (shares) Weighted Average Number of Shares Outstanding, Diluted Basic net loss per share (in usd per share) Earnings Per Share, Basic Diluted net loss per share (in usd per share) Earnings Per Share, Diluted Potentially dilutive shares excluded from the computation of diluted net income per share (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Class of Treasury Stock [Table] Class of Treasury Stock [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 Common Stock Common Stock [Member] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Common stock repurchased and retired (in shares) Stock Repurchased and Retired 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 Repurchased shares of its common stock on the open market, value Stock Repurchased and Retired During Period, Value Common Stock shares remained available for repurchase under repurchase plans (in shares) Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Stock Repurchase Program, Shares Authorized During Period Stock Repurchase Program, Increase (Decrease) in Shares Authorized Stock Repurchase Program, Increase (Decrease) in Shares Authorized Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Financial Instruments Financial Instruments Disclosure [Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus 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 Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Net (Loss) Income Per Share Earnings Per Share [Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Net Unrealized Gains (Losses) on Derivative Instruments Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Net Unrealized Gains (Losses) on Available-for-Sale Securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Defined Benefit Pension Components Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Foreign Currency Translation Adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] AOCI Attributable to Parent AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Balances, January 31, 2016 Other comprehensive (loss) income before reclassifications OCI, before Reclassifications, before Tax, Attributable to Parent Pre-tax (gains) losses reclassified from accumulated other comprehensive loss Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Tax effects Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Balances, October 31, 2016 Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Developed technologies, at cost Customer relationships, trade names, patents, and user list, at cost Customer Relationships, Trade Names, Patents, and User List [Member] Customer Relationships, Trade Names, Patents, and User List [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Other intangible assets, at cost Finite-Lived Intangible Assets, Gross Less: Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Other intangible assets, net Finite-Lived Intangible Assets, Net Income Statement [Abstract] Net revenue: Revenue, Net [Abstract] Subscription Subscription and Circulation Revenue License and other License and Services Revenue Total net revenue Cost of revenue: Cost of Revenue [Abstract] Cost of license and other revenue Total cost of revenue Cost of Revenue Gross profit Operating expenses: Operating Expenses [Abstract] Marketing and sales Research and development General and administrative Amortization of purchased intangibles Amortization of Intangible Assets Restructuring charges and other facility exit costs, net Total operating expenses (Loss) income from operations Interest and other expense, net Interest Income (Expense), Net (Loss) income before income taxes Net loss Weighted average shares used in computing basic net loss per share (shares) Weighted average shares used in computing diluted net loss per share (shares)