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Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Valuation Allowance of Deferred Tax Assets Valuation Allowance of Deferred Tax Assets [Member] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Line of Credit Facility [Abstract] Borrowing Arrangements Debt Disclosure [Text Block] Class of Stock Disclosures [Abstract] Common Stock Repurchase Program Treasury Stock [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes Senior Notes [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Notes due 2020 Senior Notes due 2020 [Member] Senior Notes due 2020 [Member] Senior Notes due 2025 Senior Notes due 2025 [Member] Senior Notes due 2025 [Member] 2015 Senior Notes 2015 Senior Notes [Member] 2015 Senior Notes [Member] Senior Notes 2017 Senior Notes due 2017 [Member] Senior Notes due 2017 [Member] Senior Notes 2022 Senior Notes due 2022 [Member] Senior Notes due 2022 [Member] 2012 Senior Notes 2012 Senior Notes [Member] 2012 Senior Notes [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt instrument, face amount Debt Instrument, Face Amount Debt instrument, stated interest rate Debt Instrument, Interest Rate, Stated Percentage Debt instrument, unamortized discount Debt Instrument, Unamortized Discount Debt issuance costs, gross Debt Issuance Costs, Gross Proceeds from debt, net of issuance costs Proceeds from Debt, Net of Issuance Costs Debt issuance redemption discount premium, percentage of principle amount Debt Issuance Redemption Discount Premium Percentage Of Principal Amount Debt Issuance Redemption Discount Premium Percentage Of Principal Amount Debt fair value Debt Instrument, Fair Value Disclosure Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Line of credit facility, additional borrowings available Line of credit facility, additional borrowings available Line of credit facility, additional borrowings available Line of credit facility, outstanding borrowings Long-term Line of Credit 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 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Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balances, January 31, 2017 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Losses included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Gains included in OCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Balances, April 30, 2017 Cost And Fair Value Of Financial 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[Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Net revenue: Revenue, Net [Abstract] Maintenance Maintenance Revenue Subscription Subscription and Circulation Revenue License and other License and Services Revenue Net revenue Revenue, Net Cost of revenue: Cost of Revenue [Abstract] Maintenance and subscription Cost of Goods Sold, Subscription and Maintenance Cost of Goods Sold, Subscription and Maintenance License and other License Costs Amortization of developed technology (1) Cost of Goods Sold, Amortization Total cost of revenue Cost of Revenue Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Segment Reporting [Abstract] Number of segment managers Number of Segment Managers Number of Segment Managers Number of operating segments Number of Operating Segments Schedule of Finite-Lived 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deposit Deposits [Member] Municipal bonds Municipal Bonds [Member] Money Market funds Money Market Funds [Member] Sovereign debt Sovereign Debt [Member] U.S. government securities US Government Debt Securities [Member] Balance Sheet Location [Axis] Marketable Securities, Current Marketable Securities, Current [Member] Marketable Securities, Current [Member] Marketable Securities, Noncurrent Marketable Securities, Noncurrent [Member] Marketable Securities, Noncurrent [Member] Convertible debt securities Other Assets [Member] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Cash equivalents Cash equivalents, Fair Value Cash and Cash Equivalents, Fair Value Disclosure Marketable securities, 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Developed Technology Rights [Member] Customer relationships, trade names, patents, and user lists, 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 Restructuring and Related Activities [Abstract] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Plan [Axis] Restructuring Plan [Axis] Restructuring Plan [Domain] Restructuring Plan [Domain] Fiscal 2017 Plan Fiscal 2017 Plan [Member] Fiscal 2017 Plan [Member] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Employee termination costs Employee Severance [Member] Lease termination and other exit costs Facility Closing [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Beginning Balance Restructuring Reserve Additions Restructuring Charges Payments Payments for Restructuring Adjustments Restructuring Reserve, Translation and Other Adjustment Ending Balance Current portion Restructuring Reserve, Current Non-current portion Restructuring Reserve, Noncurrent Total Restructuring Reserve 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) Effect of dilutive securities (shares) Weighted Average Number Diluted Shares Outstanding Adjustment Denominator for dilutive net loss per share (shares) Potentially dilutive shares excluded from the computation of diluted net income per share (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Restructuring (benefits) charges and other facility exit costs, net Restructuring and Related Activities Disclosure [Text Block] Schedule of Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Computer Equipment, Software, Furniture and Leasehold Improvements, Net Property, Plant and Equipment Disclosure [Text Block] Financial Instruments Financial Instruments Disclosure [Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Marketable securities Marketable Securities, Current Accounts receivable, net Accounts Receivable, Net, Current Prepaid expenses and other current assets Prepaid Expense and 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 Accrued income taxes Accrued Income Taxes, Current Deferred revenue Deferred Revenue, Current Current portion of long-term notes payable, net Notes Payable, Current Other accrued liabilities Other Accrued Liabilities, Current Total current liabilities Liabilities, Current Long-term deferred revenue Deferred Revenue, Noncurrent Long-term income taxes payable Accrued Income Taxes, Noncurrent Long-term deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Long-term notes payable, net Notes Payable, Noncurrent Other liabilities Other Liabilities, Noncurrent Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock and additional paid-in capital Common Stocks, Including Additional Paid in Capital Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Calculation of Numerator and Denominator in Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment, Geographic and Product Family Information Segment Reporting Disclosure [Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Concentration of Credit Risk Concentration Risk Disclosure [Text Block] Schedule of Changes in Revenue and Cost of Revenue Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] 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] Beginning balance 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 Ending balance Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Share-based Compensation Award, Tranche One Share-based Compensation Award, Tranche One [Member] Share-based Compensation Award, Tranche Two Share-based Compensation Award, Tranche Two [Member] Share-based Compensation Award, Tranche Three Share-based Compensation Award, Tranche Three [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] 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 Allocated share-based compensation expense Acceleration of eligible stock awards Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost 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 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 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 Shares issued under employee stock purchase plans (shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Awards issued, share average price (in usd 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 Weighted average grant date fair value per share of stock options granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value 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] Retained Earnings Retained Earnings [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