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Leases - Income Generated as Lessor (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2019 USD ($)
Leases [Abstract] |
Lessor, Operating Lease, Payments to be Received | $ 0.2
Lessor, Operating Lease, Assumptions and Judgments, Value of Underlying Asset, Amount | 0.4
Lessor, Operating lease, payments to be received from Decatur lease | $ 0.1

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- Definition Lessor, Operating lease, payments to be received from Decatur lease + References No definition available. + Details
Name: | laws_LessorOperatingleasepaymentstobereceivedfromDecaturlease
Namespace Prefix: | laws_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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

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- Definition Amount lessor expects from underlying asset following end of operating lease term. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
Name: | us-gaap_LessorOperatingLeaseAssumptionsAndJudgmentsValueOfUnderlyingAssetAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of lease payments to be received by lessor for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919396-209981 + Details
Name: | us-gaap_LessorOperatingLeasePaymentsToBeReceived
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant