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Revenue Recognition - Product Type (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Product Revenue [Abstract] |  |  |  |
Fastening Systems | 22.30% | 24.10% | 22.70% | 24.00%
Fluid Power | 12.60% | 15.10% | 13.20% | 15.20%
Specialty Chemicals | 12.20% | 13.10% | 13.10% | 11.60%
Cutting Tools and Abrasives | 13.30% | 11.70% | 11.70% | 13.10%
Electrical | 10.00% | 10.40% | 10.20% | 10.80%
Aftermarket Automotive Supplies | 7.00% | 7.60% | 7.10% | 7.90%
Safety | 7.00% | 4.70% | 6.40% | 4.70%
Welding and Metal Repair | 1.40% | 1.30% | 1.40% | 1.50%
Other Products | 14.20% | 12.00% | 14.20% | 11.20%
Total Products | 100.00% | 100.00% | 100.00% | 100.00%

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- Definition Aftermarket Automotive Supplies + References No definition available. + Details
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Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Cutting Tools and Abrasives + References No definition available. + Details
Name: | laws_CuttingToolsandAbrasives
Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Electrical + References No definition available. + Details
Name: | laws_Electrical
Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fastening Systems + References No definition available. + Details
Name: | laws_FasteningSystems
Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Fluid Power + References No definition available. + Details
Name: | laws_FluidPower
Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Other Products + References No definition available. + Details
Name: | laws_OtherProducts
Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Product Revenue [Abstract] + References No definition available. + Details
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X
- Definition Safety + References No definition available. + Details
Name: | laws_Safety
Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Specialty Chemicals + References No definition available. + Details
Name: | laws_SpecialtyChemicals
Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total Products + References No definition available. + Details
Name: | laws_TotalProducts
Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Welding and Metal Repair + References No definition available. + Details
Name: | laws_WeldingandMetalRepair
Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration