Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Related Party and Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Document Information [Line Items] Document Information [Line Items] EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Auditor Location Auditor Location EBP, Description of Plan and Accounting Change [Abstract] EBP, Tranche Three (Prior to 1/1/2022) [Member] EBP, Tranche Three (Prior to 1/1/2022) [Member] EBP, Tranche Three (Prior to 1/1/2022) EBP, Allocation Status [Domain] EBP, Allocation Status [Domain] Entity File Number Entity File Number EBP, Contingency [Line Items] EBP, Contingency [Line Items] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Investment Type [Axis] Investment Type [Axis] EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Tax Status EBP, Tax Status [Text Block] EBP, Contingency [Abstract] EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Text Block] Ascent [Member] Ascent [Member] Ascent EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Employer Contribution, Annual Vesting Percentage After Requisite Service Period EBP, Employer Contribution, Annual Vesting Percentage After Requisite Service Period EBP, Employer Contribution, Annual Vesting Percentage After Requisite Service Period EBP, Expense EBP, Expense [Policy Text Block] EBP, Participant Contribution, Eligible Compensation, Percentage EBP, Participant Contribution, Eligible Compensation, Percentage EBP, Participant Contribution, Eligible Compensation, Percentage Money Market Funds Money Market Funds [Member] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant EBP, Employer Contribution, Receivable EBP, Employer Contribution, Receivable EBP, Participant Contribution, Eligible Compensation, Dollar Amount EBP, Participant Contribution, Eligible Compensation, Dollar Amount EBP, Participant Contribution, Eligible Compensation, Dollar Amount EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover EBP, Requisite Service Period, Hours EBP, Requisite Service Period, Hours EBP, Requisite Service Period, Hours EBP, Payment to Participant EBP, Payment to Participant [Policy Text Block] EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] Maximum Automatic Deferral Rate [Member] Maximum Automatic Deferral Rate [Member] Maximum Automatic Deferral Rate EBP, Employer Contribution, Vesting [Domain] EBP, Employer Contribution, Vesting [Domain] EBP, Employer Contribution, Vesting EBP, Net Asset Available for Benefit EBP, Net Asset Available for Benefit Auditor Name Auditor Name EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Investment, Fair and Contract Value EBP, Investment, Excluding Plan Interest in Master Trust, Fair and Contract Value EBP, Tranche Two (Prior to 1/1/2022) [Member] EBP, Tranche Two (Prior to 1/1/2022) [Member] EBP, Tranche Two (Prior to 1/1/2022) EBP, Employer Contribution, Vesting [Axis] EBP, Employer Contribution, Vesting [Axis] EBP, Employer Contribution, Vesting EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type EBP, Participant Contribution, Automatic, Deferral Rate EBP, Participant Contribution, Automatic, Deferral Rate Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Tax Status [Abstract] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Cover [Abstract] Rahi [Member] Rahi [Member] Rahi Maximum Maximum [Member] EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Minimum Minimum [Member] Current Fiscal Year End Date Current Fiscal Year End Date EBP, Schedule of Asset Held for Investment [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment EBP, First 3 Percent Contributed [Member] EBP, First 3 Percent Contributed [Member] EBP, First 3 Percent Contributed Document Annual Report Document Annual Report Entity [Domain] Entity [Domain] Investment, Identifier [Axis] Investment, Identifier [Axis] EBP, Tranche One (After 1/1/2022) [Member] EBP, Tranche One (After 1/1/2022) [Member] EBP, Tranche One (After 1/1/2022) Document Fiscal Year Focus Document Fiscal Year Focus EBP, Allocation Status [Axis] EBP, Allocation Status [Axis] EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan EBP, Investment, Fair Value and NAV [Abstract] EBP, Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Employer Contribution, Matching Percentage EBP, Employer Contribution, Matching Percentage EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Wesco Integrated Supply [Member] Wesco Integrated Supply [Member] Wesco Integrated Supply Legal Settlement Legal Settlement Legal Settlement EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Risk and Uncertainty EBP, Risk and Uncertainty [Policy Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Repayment of Loans from Participants EBP, Repayment of Loans to Participants EBP, Repayment of Loans to Participants Auditor [Line Items] EBP, Description of Plan [Table] EBP, Description of Plan [Table] EBP, Investment EBP, Investment [Policy Text Block] EBP, Investment, Contract Value EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value EBP, Catch-Up Contribution Limit EBP, Catch-Up Contribution Limit EBP, Catch-Up Contribution Limit Amendment Flag Amendment Flag EBP, Contingency EBP, Contingency [Text Block] EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Common Collective Trust Common Collective Trust [Member] Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] EBP, Catch-Up Contribution Limit (Ages 60 to 63) EBP, Catch-Up Contribution Limit (Ages 60 to 63) EBP, Catch-Up Contribution Limit (Ages 60 to 63) Business Combination [Axis] Business Combination [Axis] EBP, Change in Net Asset Available for Benefit, Decrease EBP, Change in Net Asset Available for Benefit, Decrease EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] Disposal Group Name [Domain] Disposal Group Name [Domain] WESCO DISTRIBUTION, INC. RETIREMENT SAVINGS PLAN EBP 001 [Member] EBP 001 EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Forfeited Nonvested Account EBP, Forfeited Nonvested Account EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Document Transition Report Document Transition Report EBP, Investment, Disbursements EBP, Investment, Disbursements EBP, Investment, Disbursements EBP, Forfeited Nonvested Account, Decrease from Employer Contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Entity Address, Address Description Entity Address, Address Description EBP, Statement of Net Asset Available for Benefit [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus EBP, Description of Plan EBP, Description of Plan [Text Block] EBP, Summary of Accounting Policy EBP, Summary of Accounting Policy [Text Block] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Document Period End Date Document Period End Date EBP, Note Receivable from Participant EBP, Note Receivable from Participant [Policy Text Block] EBP, Change in Net Asset Available for Benefit, Increase EBP, Change in Net Asset Available for Benefit, Increase Other Investment Companies Other Investment Companies [Member] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] Wesco Stock Fund Wesco Stock Fund [Member] Wesco Stock Fund Entity Central Index Key Entity Central Index Key EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Legal Entity [Axis] Legal Entity [Axis] Entity Tax Identification Number Entity Tax Identification Number EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Minimum Fund Balance for Former Employees EBP, Minimum Fund Balance for Former Employees EBP, Minimum Fund Balance for Former Employees Automatic Deferral Rate Annual Increase [Member] Automatic Deferral Rate Annual Increase [Member] Automatic Deferral Rate Annual Increase EBP, Plan Name EBP, Plan Name EBP, Plan Number EBP, Plan Number EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type Document Type Document Type Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) before transfers EBP, Change in Net Asset Available for Benefit, Increase (Decrease) before transfers EBP, Change in Net Asset Available for Benefit, Increase (Decrease) before transfers EBP, Use of Estimate EBP, Use of Estimate [Policy Text Block] EBP, Next 4 Percent Contributed [Member] EBP, Next 4 Percent Contributed [Member] EBP, Next 4 Percent Contributed EBP, Tranche Two (After 1/1/2022) [Member] EBP, Tranche Two (After 1/1/2022) [Member] EBP, Tranche Two (After 1/1/2022) Statistical Measurement [Axis] Statistical Measurement [Axis] EBP, Loans from Participants EBP, Loans to Participants EBP, Loans to Participants EBP, Employer Discretionary Contribution EBP, Employer Discretionary Contribution EBP, Employer Discretionary Contribution EBP, Note Receivable from Participant EBP, Note Receivable from Participant EBP, Note Receivable from Participant Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] EBP, Schedule of Asset Held for Investment EBP, Schedule of Asset Held for Investment [Table Text Block] EBP, Automatic Deferral Rate, Type [Axis] EBP, Automatic Deferral Rate, Type [Axis] EBP, Automatic Deferral Rate, Type EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] Disposal Group Name [Axis] Disposal Group Name [Axis] EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] Business Combination [Domain] Business Combination [Domain] ISS [Member] ISS [Member] ISS EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Contingency [Table] EBP, Contingency [Table] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] EBP, Asset Held for Investment, Participant Loan, Maturity Date EBP, Asset Held for Investment, Participant Loan, Maturity Date EBP, Subsequent Event [Abstract] Investments [Domain] Investments [Domain] EBP, Self-Directed Brokerage Account EBP, Self-Directed Brokerage Account [Member] Document Information [Table] Document Information [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Stable Value Fund EBP, Stable Value Fund [Text Block] EBP, Stable Value Fund EBP, Automatic Deferral Rate, Type [Domain] EBP, Automatic Deferral Rate, Type [Domain] EBP, Automatic Deferral Rate, Type Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] Entity Registrant Name Entity Registrant Name EBP, True-Up Contribution EBP, True-Up Contribution EBP, True-Up Contribution EBP, Subsequent Event EBP, Subsequent Event [Text Block] EBP, Tax Status [Table] EBP, Tax Status [Table] Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] EBP, Receivable EBP, Receivable EBP, Risk and Uncertainty [Text Block] EBP, Risk and Uncertainty [Text Block] EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Tranche One (Prior to 1/1/2022) [Member] EBP, Tranche One (Prior to 1/1/2022) [Member] EBP, Tranche One (Prior to 1/1/2022)