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Leases Lease Terms and Interest Rate (Tables) | 12 Months Ended
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Dec. 31, 2019
Lease Terms and Interest Rate [Abstract] |
Lease Terms and Interest Rates [Table Text Block] | The weighted average lease terms and interest rates of the leases held by Lawson as of December 31, 2019 are as follows:
Lease Type |  | Weighted Average Term in Years |  | Weighted Average Interest Rate
Operating Leases |  | 3.8 |  | 5.1%
Financing Leases |  | 2.9 |  | 5.5%

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- Definition Lease Terms and Interest Rate [Abstract] + References No definition available. + Details
Name: | laws_LeaseTermsandInterestRateAbstract
Namespace Prefix: | laws_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease Terms and Interest Rates [Table Text Block] + References No definition available. + Details
Name: | laws_LeaseTermsandInterestRatesTableTextBlock
Namespace Prefix: | laws_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration