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Revenue - Percentages of Sales by Product Line (Details) - Product Line - Sales | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 100.00% | 100.00% | 100.00%
Fasteners |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 33.30% | 29.90% | 34.20%
Tools |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 8.50% | 8.20% | 9.90%
Cutting tools |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 5.00% | 4.70% | 5.70%
Hydraulics and pneumatics |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 6.40% | 5.90% | 6.80%
Material handling |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 5.60% | 5.10% | 5.90%
Janitorial supplies |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 8.20% | 9.80% | 7.80%
Electrical supplies |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 4.30% | 4.10% | 4.70%
Welding supplies |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 3.80% | 3.50% | 4.20%
Safety supplies |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 21.20% | 25.50% | 17.90%
Other |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |
Percentage of sales | 3.70% | 3.30% | 2.90%

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