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Revenue Recognition - Product Vertcal (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Product Revenue [Abstract] |  |  |  |
Fastening Systems | 24.30% | 24.60% | 23.90% | 24.40%
Fluid Power | 15.20% | 14.80% | 15.20% | 14.70%
Specialty Chemicals | 11.70% | 12.30% | 13.10% | 13.40%
Cutting Tools and Abrasives | 13.00% | 13.40% | 11.50% | 12.30%
Electrical | 10.70% | 10.80% | 11.10% | 11.00%
Aftermarket Automotive Supplies | 7.60% | 7.80% | 8.00% | 8.20%
Safety | 4.70% | 4.70% | 4.70% | 4.70%
Welding and Metal Repair | 1.60% | 2.10% | 1.70% | 2.00%
Other Products | 11.20% | 9.50% | 10.80% | 9.30%
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

X
- 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

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

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

X
- 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