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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 3,988 $ 1,309  
Interest cost 4,583 1,037  
Expected return on plan assets (8,757) (1,614)  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 102 27  
Net periodic benefit cost (84) 759  
Defined Benefit Plan, Service Cost 3,988 1,309  
Defined Benefit Plan, Plan Assets, Contributions by Employer 2,600 1,000  
Defined Contribution Plan Disclosure [Line Items]      
Assets Held-in-trust 39,800   $ 39,600
Postemployment Benefits, Period Expense 16,600 5,700  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Postemployment Benefits, Period Expense 16,600 5,700  
WESCO      
Defined Contribution Plan Disclosure [Line Items]      
Deferred Compensation Liability, Classified, Noncurrent     17,300
Anixter International      
Defined Contribution Plan Disclosure [Line Items]      
Deferred Compensation Liability, Current 43,000    
UNITED STATES      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 764 0  
Interest cost 2,137 0  
Expected return on plan assets (4,501) 0  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 0 0  
Net periodic benefit cost (1,600) 0  
Defined Benefit Plan, Service Cost 764 0  
Foreign Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 3,224 1,309  
Interest cost 2,446 1,037  
Expected return on plan assets (4,256) (1,614)  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 102 27  
Net periodic benefit cost 1,516 759  
Defined Benefit Plan, Service Cost 3,224 1,309  
WESCODeferredCompensationPlanMember      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Compensation Liability, Current and Noncurrent     27,400
Deferred Compensation Liability, Current and Noncurrent     27,400
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Nonoperating Gains (Losses) (4,100) $ (600)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Defined Benefit Plan, Expected Future Benefit Payment, Year One 17,500   18,100
Defined Benefit Plan, Expected Future Benefit Payment, Year One $ 17,500   18,100
Canadian 401K Defined Contribution Plan [Member] | Minimum [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan Employer Matching Contribution Percent 3.00%    
Canadian 401K Defined Contribution Plan [Member] | Maximum [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan Employer Matching Contribution Percent 5.00%    
US 401K Defined Contribution Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 50.00%    
Defined Contribution Plan Employer Matching Contribution Percent 6.00%    
Anixter Employee Savings Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 50.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 5.00%    
Anixter Employee Savings Plan [Member] | Minimum [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan Employer Matching Contribution Percent 2.00%    
Anixter Employee Savings Plan [Member] | Maximum [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan Employer Matching Contribution Percent 2.50%    
WESCODeferredCompensationPlanMember      
Defined Contribution Plan Disclosure [Line Items]      
Deferred Compensation Liability, Current     10,100
Anixter Deferred Compensation Plan Member      
Defined Contribution Plan Disclosure [Line Items]      
Deferred Compensation Liability, Current     45,100
Phantom Share Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Payment Arrangement, Expense $ 5,700    
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent $ 15,900   $ 22,800