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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

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