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REVENUE - Disaggregation of Revenues (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 100.00% | 100.00% | 100.00% | 100.00%
Percent of total company revenue | 100.00% | 100.00% | 100.00% | 100.00%
Operating earnings (losses) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total company revenue (as a percent) | 2.00% | 2.00% | 2.00% | 2.00%
Contractors |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 11.00% | 10.00% | 11.00% | 10.00%
Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 11.00% | 10.00% | 10.00% | 10.00%
Government Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 14.00% | 15.00% | 14.00% | 15.00%
Healthcare Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 5.00% | 6.00% | 5.00% | 6.00%
Manufacturing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 30.00% | 30.00% | 31.00% | 30.00%
Retail/Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 10.00% | 10.00% | 10.00% | 10.00%
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 5.00% | 5.00% | 6.00% | 5.00%
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 14.00% | 14.00% | 13.00% | 14.00%
High-Touch Solutions N.A. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 100.00% | 100.00% | 100.00% | 100.00%
Percent of total company revenue | 79.00% | 78.00% | 79.00% | 78.00%
High-Touch Solutions N.A. | Contractors |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 11.00% | 9.00% | 10.00% | 9.00%
High-Touch Solutions N.A. | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 10.00% | 9.00% | 10.00% | 9.00%
High-Touch Solutions N.A. | Government Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 17.00% | 19.00% | 17.00% | 19.00%
High-Touch Solutions N.A. | Healthcare Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 6.00% | 7.00% | 7.00% | 7.00%
High-Touch Solutions N.A. | Manufacturing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 30.00% | 29.00% | 31.00% | 30.00%
High-Touch Solutions N.A. | Retail/Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 9.00% | 10.00% | 9.00% | 10.00%
High-Touch Solutions N.A. | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 5.00% | 5.00% | 5.00% | 5.00%
High-Touch Solutions N.A. | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 12.00% | 12.00% | 11.00% | 11.00%
Endless Assortment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 100.00% | 100.00% | 100.00% | 100.00%
Percent of total company revenue | 19.00% | 20.00% | 19.00% | 20.00%
Endless Assortment | Contractors |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 15.00% | 15.00% | 15.00% | 15.00%
Endless Assortment | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 16.00% | 14.00% | 15.00% | 15.00%
Endless Assortment | Government Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 2.00% | 3.00% | 3.00% | 3.00%
Endless Assortment | Healthcare Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 2.00% | 2.00% | 2.00% | 2.00%
Endless Assortment | Manufacturing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 29.00% | 30.00% | 29.00% | 29.00%
Endless Assortment | Retail/Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 15.00% | 10.00% | 15.00% | 10.00%
Endless Assortment | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 3.00% | 3.00% | 3.00% | 3.00%
Endless Assortment | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales (as a percent) | 18.00% | 23.00% | 18.00% | 23.00%

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