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EMPLOYEE BENEFIT PLANS TEXTUALS (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
numberOfPlans
Dec. 31, 2021
USD ($)
numberOfPlans
Dec. 31, 2020
USD ($)
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, cost recognized $ 58,200 $ 54,700 $ 18,300
Defined Benefit Plan, Description Wesco sponsors a contributory defined benefit plan covering substantially all Canadian employees of EECOL Electric Corp., a wholly-owned subsidiary of the Company (the “EECOL Plan”). The EECOL Plan provides retirement benefits based on earnings and credited service, and participants contribute 2% of their earnings to the EECOL Plan. Participants become 100% vested after two years of continuous service or, if earlier, at the participant's normal retirement age.    
Defined Benefit Plan, Unfunded Plan Wesco also sponsors a Supplemental Executive Retirement Plan for certain executives of EECOL Electric Corp. (the “EECOL SERP”), which provides additional pension benefits based on earnings and credited service. Effective January 1, 2013, the EECOL SERP was closed to new participants and existing participants became 100% vested. Participants of the EECOL SERP now contribute 4% of their earnings to the EECOL Plan.Anixter Inc. sponsors the Anixter Inc. Pension Plan, which was closed to entrants first hired or rehired on or after July 1, 2015, and various defined benefit pension plans covering employees of foreign subsidiaries in Canada and Europe (together with the EECOL Plan and the EECOL SERP, the “Foreign Plans”). The majority of the Company's defined benefit pension plans are non-contributory, and with the exception of the U.S. and Canada, cover substantially all full-time employees in their respective countries. Retirement benefits are provided based on compensation as defined in each of the plan agreements    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.60% 2.60%  
Defined Benefit Plan, Benefit Obligation $ 520,758 $ 725,879 819,339
DefinedBenefitPlanNumberOfPlansWithProjectedBenefitObligationsInExcessOfFairValueOfPlanAssets | numberOfPlans 7 9  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation $ 119,000 $ 214,500  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 91,000 167,400  
Defined Benefit Plan, Plan Assets, Amount $ 552,693 $ 752,512 721,005
DefinedBenefitPlanNumberOfPlansWithAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssets | numberOfPlans 7 9  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation $ 113,700 $ 194,600  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets 91,000 167,400  
Service Cost $ 8,317 15,173 10,792
Defined Benefit Plan Assets Actual Gain Loss (25.10%)    
Defined Benefit Plan, Expected Future Benefit Payment, Year One $ 152,775    
Increase (Decrease) in Other Operating Assets 153,166 56,274 (2,321)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment $ 0 36,580 0
WESCO [Member]      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 50.00%    
Defined contribution plan, maximum annual contribution per employee, percent 6.00%    
Defined contribution plan, employer discretionary contribution amount   13,100 0
Anixter Employee Savings Plan [Member]      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 50.00%    
Defined contribution plan, maximum annual contribution per employee, percent 5.00%    
WESCO Deferred Compensation Plan      
Schedule of Employee Benefit Plans [Line Items]      
Deferred Compensation Liability, Classified, Noncurrent   20,900  
AnixterDeferred Compensation Plan      
Schedule of Employee Benefit Plans [Line Items]      
Deferred Compensation Arrangement with Individual, Distribution Paid   42,800  
Increase (Decrease) in Other Operating Assets   $ 39,700  
Defined Contribution Pension Plan for Employees of Anixter Canada Inc.      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 6.00%    
Defined contribution plan, maximum annual contribution per employee, percent 5.50%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 25.00%    
Canadian Defined Contribution Plan Merger      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 50.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 4.00%    
U.S. Defined Contribution Plan Merger      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 100.00%    
Foreign Plan [Member]      
Schedule of Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.80% 2.40%  
Defined Benefit Plan, Benefit Obligation $ 267,258 $ 424,096 486,855
Defined Benefit Plan, Plan Assets, Amount 267,574 381,781 365,718
Accumulated Benefit Obligation (ABO) at December 31 253,200 390,800  
Service Cost 8,317 $ 12,140 9,029
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 7,000    
Defined Benefit Plan, Expected Future Benefit Payment, Year One $ 9,580    
United States      
Schedule of Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.40% 2.90%  
Defined Benefit Plan, Benefit Obligation $ 253,500 $ 301,783 332,484
Defined Benefit Plan, Plan Assets, Amount 285,119 370,731 355,287
Accumulated Benefit Obligation (ABO) at December 31 253,500 301,800  
Service Cost 0 3,033 1,763
Defined Benefit Plan, Expected Future Benefit Payment, Year One $ 143,195    
Minimum | WESCO Distribution Canada Defined Contribution plan [Member]      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 3.00%    
Defined Contribution Plan, Employer Matching Contribution greater than 20 years of service, Percent of Employees' Gross Pay 5.00%    
Minimum | Anixter Employee Savings Plan [Member]      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution discretionary contribution percentage 2.00%    
Minimum | Defined Contribution Pension Plan for Employees of Anixter Canada Inc.      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 3.00%    
Minimum | Canadian Defined Contribution Plan Merger      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 3.00%    
Minimum | U.S. Defined Contribution Plan Merger      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 3.00%    
Maximum | WESCO Distribution Canada Defined Contribution plan [Member]      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 5.00%    
Defined Contribution Plan, Employer Matching Contribution greater than 20 years of service, Percent of Employees' Gross Pay 7.00%    
Maximum | Anixter Employee Savings Plan [Member]      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution discretionary contribution percentage 2.50%    
Maximum | Defined Contribution Pension Plan for Employees of Anixter Canada Inc.      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 4.00%    
Maximum | Canadian Defined Contribution Plan Merger      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 5.00%    
Maximum | U.S. Defined Contribution Plan Merger      
Schedule of Employee Benefit Plans [Line Items]      
Defined contribution plan, employer matching contribution, percent 4.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 50.00%    
Pension Plan [Member]      
Schedule of Employee Benefit Plans [Line Items]      
Other Nonoperating Gains (Losses) $ (14,800) $ (53,200) $ (8,200)
WESCO Deferred Compensation Plan      
Schedule of Employee Benefit Plans [Line Items]      
Deferred Compensation Liability, Classified, Noncurrent $ 20,300