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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]          
Assets Held-in-trust $ 39,500   $ 39,500    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Service cost 1,668 $ 1,139 2,977 $ 2,288  
Interest cost 1,288 1,080 2,325 2,169  
Expected return on plan assets 1,988 1,410 3,603 2,832  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (26) 15 (53) 31  
Net periodic benefit cost 994 794 1,752 1,594  
Defined Benefit Plan, Service Cost 1,668 1,139 2,977 2,288  
Defined Benefit Plan, Plan Assets, Contributions by Employer 800   1,800    
Postemployment Benefits, Period Expense     9,300 18,900  
WESCO          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Deferred Compensation Liability, Classified, Noncurrent 24,400   24,400   $ 25,200
Anixter International          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Deferred Compensation Liability, Classified, Noncurrent 42,600   42,600    
Deferred Compensation Liability, Current 3,800   3,800    
Deferred Compensation Liability, Current 3,800   3,800    
Pension Plan [Member]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Other Nonoperating Gains (Losses) (700) $ (300) $ (1,200) $ (700)  
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 Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent     5.00%    
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%    
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     $ 900    
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent $ 11,300   $ 11,300