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Compensation Compensation Related Costs, General [Text Block] 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] Employee termination costs Employee Severance [Member] Lease termination and other exit costs 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 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 Goodwill Goodwill Disclosure [Text Block] Income Tax Income Tax Disclosure [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Recently Issued Accounting Standards New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Changes in Revenue and Cost of Revenue Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] 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] Computer hardware, at cost Computer Equipment [Member] Computer software, at cost Software Development [Member] Leasehold improvements, land and buildings, at cost Land, Buildings and Improvements [Member] Furniture and equipment, at cost Furniture and Equipment [Member] Furniture and Equipment [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Computer software, hardware, leasehold improvements, furniture and equipment, gross Property, Plant and Equipment, Gross Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Computer software, hardware, leasehold improvements, furniture and equipment, net Range of expected volatilities Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Range of expected lives (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected dividends Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Range of risk-free interest rates Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Cost And Fair Value Of Financial Instruments Disclosure Cost And Fair Value Of Financial Instruments [Table Text Block] Cost and Fair Value of Financial Instruments Disclosure [Table Text Block] Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Available-for-sale Securities Available-for-sale Securities [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance Derivative Instruments, Gain (Loss) [Table Text Block] Restructuring charges and other facility exit costs, net Restructuring and Related Activities Disclosure [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 Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 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 Total other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Ending balance Business Combinations [Abstract] Acquisitions Business Combination Disclosure [Text Block] Risks and Uncertainties [Abstract] Concentration of Credit Risk Concentration Risk Disclosure [Text Block] 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 Concentration of Risk [Table] Concentration Risk [Table] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Tech Data Tech Data [Member] Tech Data [Member] Concentration Risk by Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Net Revenue Sales Revenue, Net [Member] Accounts Receivable Accounts Receivable [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Unsecured revolving credit facility Line of Credit Facility, Maximum Borrowing Capacity Concentration risk Concentration Risk, Percentage Other comprehensive (loss) income, net of reclassifications: Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract] Net loss on derivative instruments (net of tax effect of $0.3, $0.2, $1.7 and ($0.6), respectively) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent Change in net unrealized gain (loss) on available-for-sale securities (net of tax effect of ($0.4), $0.0, ($0.3), and ($0.6), 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 $0.0, $0.0, $0.0, and ($0.2), respectively) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Net change in cumulative foreign currency translation (loss) gain (net of tax effect of $0.0, ($0.5), ($0.9) and ($0.5), respectively) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Other Intangible Assets, Net Intangible Assets Disclosure [Text Block] Schedule of Expected Restructuring Costs Schedule of Expected Restructuring Costs [Table Text Block] Schedule of Expected Restructuring Costs [Table Text Block] Number of segment managers Number of Segment Managers Number of Segment Managers Number of operating segments Number of Operating Segments Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [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] 3.5% Notes due June 15, 2027 3.5% Notes due June 15, 2027 [Member] 3.5% Notes due June 15, 2027 [Member] Senior Notes 2017 Senior Notes due 2017 [Member] Senior Notes due 2017 [Member] 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 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 Redemption price Debt Instrument, Redemption Price Debt Instrument, Redemption Price Repayments of debt Repayments of Debt 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 Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value by Asset Class [Axis] Asset Class [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Asset Class [Domain] Derivative Contracts Derivative [Member] Convertible Debt Securities Fair Value, Assets 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 Losses included in OCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Balances, October 31, 2017 Financial Instruments Financial Instruments Disclosure [Text Block] Securities in a continuous unrealized loss position for more than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Cost method investments Cost Method Investments Other than temporary impairment losses, investments Other than Temporary Impairment Losses, Investments Gain (loss) from sale or redemption of available for sale securities Available-for-sale Securities, Gross Realized Gain (Loss) Proceeds from sale and maturity of marketable securities Proceeds from Sale and Maturity of Marketable Securities