Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Title of 12(b) Security Title of 12(b) Security Inventory Financing Agreements [Domain] Inventory Financing Agreements [Domain] [Domain] for Inventory Financing Agreements [Axis] Document Fiscal Year Focus Document Fiscal Year Focus Remaining performance obligations, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Proceeds from accounts payable-inventory financing-product financing Proceeds From Accounts Payable-Inventory Financing, Product Financing Proceeds From Accounts Payable-Inventory Financing, Product Financing Adjustment to Compensation, Amount Adjustment to Compensation Amount Segment Reporting [Abstract] Segment Reporting [Abstract] Senior notes due December 2028 Senior Notes Due December 2028 [Member] Senior Notes Due December 2028 Common stock, $0.01 par value, 1,000.0 shares authorized; 125.3 and 129.4 shares outstanding, respectively Common Stock, Value, Issued Payment of incentive compensation plan withholding taxes Payment, Tax Withholding, Share-Based Payment Arrangement Depreciation and amortization Depreciation, Amortization and Accretion, Net Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table] Accounts Payable, Inventory Financing - Supplier Financing Accounts Payable, Inventory Financing - Supplier Financing [Member] Accounts Payable, Inventory Financing [Member] Compensation Employee-related Liabilities, Current Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Restatement Determination Date Restatement Determination Date Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Derivative Instrument [Axis] Derivative Instrument [Axis] Amendment Flag Amendment Flag Data Storage and Servers Data Storage and Servers [Member] Enterprise and Data Data Storage (Including Drives) [Member] Inventory Financing Agreements Inventory Financing Agreements [Text Block] Inventory financing agreements Current liabilities: Liabilities, Current [Abstract] Provision for credit losses Accounts Receivable, Credit Loss Expense (Reversal) Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Senior notes due 2029 Senior Notes due 2029 [Member] Senior Notes due 2029 Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Total long-term liabilities Liabilities, Noncurrent Deferred income taxes Increase (Decrease) in Deferred Income Taxes Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Long-term liabilities: Liabilities, Noncurrent [Abstract] Other intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Notional amount Derivative, Notional Amount Basic (in shares) Basic weighted-average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Inventory Financing Agreements [Table] Inventory Financing Agreements [Table] Inventory Financing Agreements [Table] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Receivable financing liability Receivable Financing Liability [Member] Receivable Financing Liability Entity Address, City or Town Entity Address, City or Town Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Netcomm Products NetComm Products [Member] NetComm Products [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Current maturities of long-term debt Long-Term Debt, Current Maturities United States UNITED STATES Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Segment Information Segment Reporting [Table Text Block] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Repayments of borrowings under revolving credit facility Repayments of Lines of Credit Document Period End Date Document Period End Date Net cash (used in) provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Preferred stock, outstanding (in shares) Preferred Stock, Shares Outstanding Security Exchange Name Security Exchange Name Debt instrument, term Debt Instrument, Term Other Sales Channel, Other [Member] Sales Channel, Other [Member] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Net income per common share: Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Schedule of Weighted Average Number of Shares Schedule of Weighted Average Number of Shares [Table Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Net Sales from External Customer [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Capital expenditures Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Weighted-average common shares outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Education Education Segment [Member] Education Segment Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Other long-term obligations Carrying value Long-Term Debt, Gross Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Miscellaneous receivables Other Receivables, Net, Current Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Senior unsecured term loan facility Senior Unsecured Term Loan Facility [Member] Senior Unsecured Term Loan Facility Diluted (in shares) Diluted weighted-average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Dividends paid (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Proceeds from borrowings under revolving credit facility Proceeds from Lines of Credit Gross profit Gross Profit Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Goodwill Goodwill [Text Block] Senior unsecured revolving loan facility due 2030 Senior Unsecured Revolving Loan Facility Due 2030 [Member] Senior Unsecured Revolving Loan Facility Due 2030 Award Timing Predetermined Award Timing Predetermined [Flag] Intangible Asset, Goodwill and Other [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Equity-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Effective income tax rate reconciliation, percent Effective Income Tax Rate Reconciliation, Percent All Executive Categories All Executive Categories [Member] Repurchases of common stock Stock Repurchased and Retired During Period, Value Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Services Services [Member] Services [Member] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Accounting Changes and Error Corrections [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Segment Information Segment Reporting [Text Block] Dividend payments Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Effect of exchange rate changes on cash, cash equivalents, and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in 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Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Total long-term debt Long-Term Debt, Excluding Current Maturities, Net Of Deferred Financing Costs, Discount, Or Premium Long-Term Debt, Excluding Current Maturities, Net Of Deferred Financing Costs, Discount, Or Premium Senior notes due 2034 Senior Notes Due 2034 [Member] Senior Notes Due 2034 Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Accrued expenses and other current liabilities: Accrued Liabilities, Current [Abstract] Other Other Products and Services [Member] Other Products and Services [Member] Total unsecured senior notes Unsecured Senior Notes [Member] Unsecured Senior Notes [Member] Total accounts receivable Accounts Receivable, after Allowance for Credit Loss Repayments of long-term debt Repayments of Long-Term Debt Unamortized debt issuance costs and discount Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Description of Business Description Of Business [Policy Text Block] Description of Business [Policy Text Block] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Accounts payable-trade Accounts Payable, Trade, Current Adoption Date Trading Arrangement Adoption Date Interest Rate Debt Instrument, Interest Rate, Stated Percentage Total stockholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Senior notes due 2030 Senior Notes Due 2030 [Member] Senior Notes Due 2030 Inventory Financing Agreements [Abstract] Inventory Financing Agreements [Abstract] Inventory Financing Agreements [Abstract] Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Software Software Products [Member] Software Products [Member] Accounts payable and other liabilities Accounts Payable and Accrued Liabilities, Noncurrent Insider Trading Policies and Procedures [Line Items] Other Proceeds from (Payment for) Other Financing Activity Allowance for credit loss, current Accounts Receivable, Allowance for Credit Loss, Current Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Prepaid expenses and other Prepaid Expense and Other Assets, Current Selling and administrative expenses Selling, General and Administrative Expense Interest expense, net Interest Income (Expense), Nonoperating Collaboration Collaboration [Member] Collaboration Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments Anti-dilutive shares (fewer than) (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Proceeds from short-term investments Proceeds from Sale of Short-Term Investments Entity Central Index Key Entity Central Index Key Paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Headquarters Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Other Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Hardware Total Hardware Total Hardware [Member] Total Hardware [Member] Income Statement [Abstract] Income Statement [Abstract] Stockholders’ equity: Equity, Attributable to Parent [Abstract] Coworker Stock Purchase Plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Transferred at a point in time where CDW is principal Transferred At Point In Time, Principal [Member] Transferred At Point In Time, Principal [Member] Senior notes due 2026 Senior Notes Due 2026 [Member] Senior Notes Due 2026 Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] City Area Code City Area Code Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Fair value Debt Instrument, Fair Value Disclosure Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Senior notes due 2031 Senior Notes Due 2031 [Member] Senior Notes Due 2031 Statement [Line Items] Statement [Line Items] Total Assets Assets Percentage of Total Net Sales Revenue Net, By Product And Service, Percentage Revenue Net, By Product And Service, Percentage Long-term Contract with Customer Long-Term Contract with Customer [Member] Preferred stock, issued (in shares) Preferred Stock, Shares Issued Operating Segments Operating Segments [Member] Corporate Sales Channel, Corporate [Member] Sales Channel, Corporate [Member] Coworker Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Contract with Customer, Duration [Domain] Contract with Customer, Duration [Domain] Other assets Increase (Decrease) in Other Operating Assets PEO PEO [Member] Equity-based compensation expense Share-Based Payment Arrangement, Expense Repurchases of common stock (in shares) Stock Repurchased and Retired During Period, Shares Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Other Hardware Other Hardware [Member] Other Hardware [Member] Revenue recognized from contract with customer Contract with Customer, Liability, Revenue Recognized Accumulated Deficit Retained Earnings [Member] Operating lease liabilities Operating Lease, Liability, Noncurrent Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Shareholders' Equity (Deficit) [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Incentive compensation plan stock withheld for taxes Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Transferred at a point in time where CDW is agent Transferred At Point In Time, Agent [Member] Transferred At Point In Time, Agent [Member] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Inventory Financing Agreements [Line Items] Inventory Financing Agreements [Line Items] Inventory Financing Agreements [Line Items] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Net sales Total Net sales Revenue from Contract with Customer, Excluding Assessed Tax Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Additional borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Transferred over time where CDW is principal Transferred Over Time, Principal [Member] Transferred Over Time, Principal [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Accounts Receivable and Contract Balances Revenue from Contract with Customer [Text Block] Fair Value Measurements and Financial Instruments Financial Instruments Disclosure [Text Block] Senior notes due April 2028 Senior Notes Due April 2028 [Member] Senior Notes Due April 2028 Other Payment for (Proceeds from) Other Investing Activity Merchandise inventory Increase (Decrease) in Inventories Segment Reporting [Table] Segment Reporting [Table] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Amount owed under revolving loan financing agreement Amount Owed Under Revolving Loan Financing Agreement Amount Owed Under Revolving Loan Financing Agreement Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating income Operating Income (Loss) Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Unbilled accounts receivable, noncurrent Unbilled Receivables, Noncurrent Unbilled Receivables, Noncurrent Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] Derivative [Line Items] Derivative [Line Items] Senior unsecured term loan facility due 2030 Senior Unsecured Term Loan Facility Due 2030 [Member] Senior Unsecured Term Loan Facility Due 2030 Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Shares issued under equity-based compensation plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Income taxes paid, net Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Advertising Accrued Advertising, Current Entity Small Business Entity Small Business Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Accounts payable-trade Increase (Decrease) in Accounts Payable, Trade Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Document Type Document Type Acquisitions of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Fair Value as of Grant Date Award Grant Date Fair Value Common stock shares issued not disclosed Common Stock Shares Issued Not Disclosed Common Stock Shares Issued Not Disclosed Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Senior unsecured revolving loan facility Senior Unsecured Revolving Loan Facility [Member] Senior Unsecured Revolving Loan Facility Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Accounts Payable, Inventory Financing - Product Financing Accounts Payable, Inventory Financing - Product Financing [Member] Accounts Payable, Inventory Financing - Product Financing Description of Business and Summary of Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Changes in assets and liabilities: Increase (Decrease) in Operating Assets [Abstract] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Inventory Financing Agreements [Axis] Inventory Financing Agreements [Axis] Inventory Financing Agreements [Axis] Commitments and contingencies (Note 10) Commitments and Contingencies Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Merchandise inventory Inventory, Net All Award Types Award Type [Domain] Other long-term obligations Other long-term obligations [Member] Other long-term obligations [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Supplementary disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Reclassification of cash flow hedge to net income Reclassification of cash flow hedge to net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] PEO Name PEO Name Geographical [Axis] Geographical [Axis] Government Sales Channel, Government [Member] Sales Channel, Government [Member] Contract liabilities Contract with Customer, Liability Healthcare Sales Channel, Healthcare [Member] Sales Channel, Healthcare [Member] Other segment expense items Segment Reporting, Other Segment Item, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Unrealized gain (loss) from cash flow hedge Unrealized gain (loss) from hedge accounting Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Number of operating segments which do not meet reportable unit quantitative threshold Number of Operating Segments, Reportable Unit Quantitative Threshold Not Met Number of Operating Segments, Reportable Unit Quantitative Threshold Not Met Cash, cash equivalents, and restricted cash—beginning of period Cash, cash equivalents and restricted cash—end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Other Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Number of owned subsidiaries Number Of Owned Subsidiaries Number Of Owned Subsidiaries Desktops Desktops [Member] Desktops [Member] Accounts receivable, sale Accounts Receivable, Sale Schedule of Long-term Debt Instruments Schedule of Debt [Table Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Earnings Per Share, Basic Repurchases of common stock Payments for Repurchase of Common Stock Contract liabilities Contract with Customer, Liability, Current Total current assets Assets, Current Insider Trading Arrangements [Line Items] Payments on accounts payable-inventory financing-product financing Payments For Accounts Payable-Inventory Financing, Product Financing Payments For Accounts Payable-Inventory Financing, Product Financing Debt Long-Term Debt, Excluding Current Maturities Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net of allowance for credit losses of $68.4 and $65.2, respectively Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Accounts receivable, current Billed Receivables, Current Billed Receivables, Current Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Net change in accounts payable-inventory financing-supplier financing Net Change in Accounts Payable-Inventory Financing, Supplier Financing Net change in accounts payable-inventory financing Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Rest of World Non-US [Member] Current maturities of long-term debt Long-term Debt, Current Maturities, Gross Amount of long-term debt before deduction of unamortized deferred financing costs, discount, or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt, and other types of debt. Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total Liabilities and Stockholders’ Equity Liabilities and Equity Education Sales Channel, Education [Member] Sales Channel, Education [Member] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segments [Axis] Segments [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Commercial Commercial Segment [Member] Commercial Segment Other income (expense), net Other Nonoperating Income (Expense) Sales and income taxes Sales and Excise Tax Payable, Current Debt Long-Term Debt [Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, $0.01 par value, 100.0 shares authorized; no shares issued or outstanding for both periods Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Accounts payable-inventory financing Accounts Payable, Inventory Financing Accounts payable, inventory financing. Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Notebooks/Mobile Devices Notebooks.Mobile Devices [Member] Notebooks.Mobile Devices [Member] Other Other Operating Segment [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Financial Services Sales Channel, Financial Services [Member] Sales Channel, Financial Services Accounts receivable and other assets, noncurrent Accounts Receivable, After Allowance For Credit Loss And Other Assets, Noncurrent Accounts Receivable, After Allowance For Credit Loss And Other Assets, Noncurrent Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization expense Depreciation, Depletion and Amortization Inventory financing agreements Inventory Financing Agreements Inventory Financing Agreements Shares issued under equity-based compensation plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Current assets: Assets, Current [Abstract] Interest Rate Cap Interest Rate Cap [Member] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense Income tax expense (benefit) Income Tax Expense (Benefit) Cost of sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Inventory financing agreement, payment terms (in days) Inventory Financing Agreement, Payment Terms Inventory Financing Agreement, Payment Terms Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Net income Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Foreign currency translation and other Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent1 Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent1 Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from stock option exercises Proceeds from Stock Options Exercised Schedule of Remaining Performance Obligations Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Government Government Segment [Member] Government Segment Schedule of Contract with Customer Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]