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Revenue - Percentages of Sales by Product Line (Details) - Product Line - Sales | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 100.00% | 100.00% | 100.00% | 100.00%
Fasteners |  |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 26.00% | 34.50% | 29.30% | 34.70%
Tools |  |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 6.60% | 9.80% | 7.90% | 9.90%
Cutting tools |  |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 3.90% | 5.80% | 4.60% | 5.80%
Hydraulics & pneumatics |  |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 5.00% | 6.80% | 5.80% | 6.90%
Material handling |  |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 4.40% | 5.90% | 5.00% | 5.90%
Janitorial supplies |  |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 10.60% | 7.70% | 9.50% | 7.60%
Electrical supplies |  |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 4.00% | 4.70% | 4.30% | 4.70%
Welding supplies |  |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 2.90% | 4.20% | 3.40% | 4.20%
Safety Supplies |  |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 34.00% | 17.50% | 27.30% | 17.40%
Other |  |  |  |
Percentage of Sales by Product Line [Line Items] |  |  |  |
Percentage of sales | 2.60% | 3.10% | 2.90% | 2.90%

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