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Comprehensive Income (Loss), Net of Tax, Attributable to Parent Revenue, Methods, Inputs, and Assumptions Used [Abstract] Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Intangible Asset, Finite-Lived, Acquired, Weighted-Average Amortization Period Subsequent Events [Abstract] Subsequent Events [Abstract] Acquired Finite-Lived Intangibles Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Other Liabilities, Current Other Liabilities, Current Other assets Other Assets, Noncurrent Document Type Document Type Cash paid for acquisition Cash paid for acquisition Payments to Acquire Businesses, Net of Cash Acquired Gain (Loss) on Extinguishment of Debt Gain (Loss) on Extinguishment of Debt Aggregate Intrinsic Value, Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Schedule of Goodwill [Table] Goodwill [Table] Long-Lived Asset, Disposed of Other than by Sale, Gain (Loss) from Disposal Long-Lived Asset, Disposed of Other than by Sale, Gain (Loss) from Disposal Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Proceeds from issuance of long-term debt Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Unrecorded Unconditional Purchase Obligation [Line Items] Unrecorded Unconditional Purchase Obligation [Line Items] CANADA CANADA Consolidation Items [Axis] Consolidation Items [Axis] Entity Registrant Name Entity Registrant Name Entity Address, Postal Zip Code Entity Address, Postal Zip Code Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Commitments and Contingencies Commitments and Contingencies Intangible Asset, Finite-Lived, before Accumulated Amortization Intangible Asset, Finite-Lived, before Accumulated Amortization Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Income Tax Contingency [Table] Income Tax Contingency [Table] O2024Q3Dividends O2024Q3Dividends [Member] O2024Q3Dividends Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Weighted Average Remaining Contractual Term, Exercisable (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted-Average Remaining Contractual Term Inventories, net Inventory, Net Award Type [Domain] Award Type [Domain] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Accrued payroll and benefit costs Business Combination, Recognized Liability Assumed, Accrued Payroll and Benefit Costs Business Combination, Recognized Liability Assumed, Accrued Payroll and Benefit Costs Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information [Abstract] Expected life (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense) Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense) Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, Amortization Expense Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, Amortization Expense O2026Q2Dividends O2026Q2Dividends [Member] O2026Q2Dividends Geographical [Axis] Geographical [Axis] Income Tax Paid, before Refund Received Income Tax Paid, before Refund Received Segment Reporting, Other Segment Item, Amount Segment Reporting, Other Segment Item, Amount Entity Tax Identification Number Entity Tax Identification Number Weighted Average Exercise Price, Exercisable (in dollars per share) Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Weighted Average Exercise Price, Exercises in Period (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Preferred Stock Dividends, Income Statement Impact Preferred Stock Dividends, Income Statement Impact Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation UBS UBS [Member] UBS Tax Year 2024 Tax Year 2024 [Member] Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Accounts payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Business Combination, Reason for Business Combination Business Combination, Reason for Business Combination Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Tax Period [Axis] Tax Period [Axis] Business Combination, Recognized Asset Acquired, Other current and noncurrent assets Business Combination, Recognized Asset Acquired, Other current and noncurrent assets Business Combination, Recognized Asset Acquired, Other current and noncurrent assets Schedule of Debt Schedule of Debt [Table Text Block] Business Combination, Recognized Asset Acquired, Distribution Agreement intangible asset Business Combination, Recognized Asset Acquired, Distribution Agreement intangible asset Business Combination, Recognized Asset Acquired, Distribution Agreement intangible asset Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Earnings Per Share, Basic Deferred Revenue Deferred Revenue Payments for Repurchase of Common Stock Payments for Repurchase of Common Stock Assets, Current Assets, Current Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Total long-term debt Long-Term Debt, Excluding Current Maturities Award Type [Axis] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Award Type [Axis] Accounts Receivable, after Allowance for Credit Loss, Current Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Pension Plan [Member] Pension Plan [Member] Common Stock Common Stock [Member] WESCO expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Cover page. Cover [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Non-US [Member] Non-US [Member] Redemption Premium Redemption Premium Deferred Revenue, Noncurrent Deferred Revenue, Noncurrent APIC, Share-based Payment Arrangement, Recognition and Exercise APIC, Share-Based Payment Arrangement, Recognition and Exercise Foreign Line of Credit Foreign Line of Credit [Member] Goodwill, Foreign Currency Translation, Gain (Loss) Goodwill, Foreign Currency Translation, Gain (Loss) Purchase Obligation, to be Paid, Remainder of Fiscal Year Purchase Obligation, to be Paid, Remainder of Fiscal Year Unrecorded Unconditional Purchase Obligations Disclosure Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] Other Nonoperating Gains (Losses) Other Nonoperating Gains (Losses) Asset Acquisition [Line Items] Asset Acquisition [Line Items] Liabilities and Equity Liabilities and Equity Liabilities and Equity Share-based Payment Arrangement, Option Share-Based Payment Arrangement, Option [Member] Dividends Payable, Date to be Paid Dividends Payable, Date to be Paid Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Other current and noncurrent liabilities Increase (Decrease) in Other Operating Liabilities Income Tax Authority [Domain] Income Tax Jurisdiction [Domain] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Five Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Five Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Finite-Lived Intangible Asset, Expected Amortization, Total Finite-Lived Intangible Asset, Expected Amortization, Total Finite-Lived Intangible Asset, Expected Amortization, Total Aggregate Intrinsic Value, Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Derivatives and Fair Value Derivatives and Fair Value [Text Block] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding Preferred Stock, Value, Issued Share Repurchase Program [Axis] Share Repurchase Program [Axis] Dividends Payable [Line Items] Dividends Payable [Line Items] Dividends Payable [Table] Dividends Payable [Table] Newark Newark [Member] Newark Class of Stock [Domain] Class of Stock [Domain] Interest Paid, Excluding Capitalized Interest, Operating Activity Interest Paid, Excluding Capitalized Interest, Operating Activity Capital expenditures Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] O2026Q3Dividends O2026Q3Dividends [Member] O2026Q3Dividends Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Business Combination, Date of Acquisition Agreement Business Combination, Date of Acquisition Agreement Deferred Revenue, Revenue Recognized Deferred Revenue, Revenue Recognized INCOME TAXES Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Debt Instrument [Line Items] Debt Instrument [Line Items] Total purchase consideration Business Combination, Consideration Transferred Retirement Plan Type [Domain] Retirement Plan Type [Domain] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Indefinite-lived Intangible Assets [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Dividends [Axis] Dividends [Axis] Restatement [Axis] Revision of Prior Period [Axis] Dividends Payable, Date Declared Dividends Payable, Date Declared Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Tax Period [Domain] Tax Period [Domain] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] O2024Q1Dividends O2024Q1Dividends [Member] O2024Q1Dividends 5.250% Senior Notes due 2031 5.250% Senior Notes due 2031 [Member] 5.250% Senior Notes due 2031 Preferred Stock, Redemption Amount Preferred Stock, Redemption Amount Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Selling, general, and administrative payroll expenses Selling, general, and administrative payroll expenses Selling, general, and administrative payroll expenses Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Senior Notes [Member] Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested in Period, Weighted Average Fair Value (in dollars 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 Provision for income taxes Income Tax Expense (Benefit) Cost of goods sold Cost of Product and Service Sold Technology-Based Intangible Assets Technology-Based Intangible Assets [Member] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation 6.375% Senior Notes due 2029 6.375% Senior Notes due 2029 [Member] 6.375% Senior Notes due 2029 Forecast [Member] Forecast [Member] Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount Loss Contingency, Accrual, Current Loss Contingency, Accrual, Current New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Accounting Standards Update and Change in Accounting Principle [Text Block] Net income attributable to WESCO International, Inc. Net Income (Loss) Attributable to Parent Net income (loss) attributable to WESCO International, Inc. Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Share-based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block] Share-Based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block] Statement [Table] Statement [Table] entroCIM entroCIM [Member] entroCIM Fair value adjustment to the Anixter Notes Debt Instrument, Unamortized Premium 6.375% Senior Notes due 2033 6.375% Senior Notes due 2033 [Member] 6.375% Senior Notes due 2033 Payments for (Proceeds from) Productive Assets Payments for (Proceeds from) Productive Assets Business Combination, Effective Date of Acquisition Business Combination, Effective Date of Acquisition Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Forfeitures Chief Executive Officer [Member]