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v3.19.1

Leases - Cash Outflows of the Leasing Activity (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Leases [Abstract] |
Operating cash flows from operating leases | $ 808
Operating cash flow from financing leases | 6
Financing cash flow from financing leases | $ 52

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- Definition Financing cash flow from financing leases + References No definition available. + Details
Name: | laws_Financingcashflowfromfinancingleases
Namespace Prefix: | laws_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating cash flow from financing leases + References No definition available. + Details
Name: | laws_Operatingcashflowfromfinancingleases
Namespace Prefix: | laws_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition operating cash flows from operating leases + References No definition available. + Details
Name: | laws_Operatingcashflowsfromoperatingleases
Namespace Prefix: | laws_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration