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Basis of Presentation and Summary of Significant Accounting Policies Cumulative adjustment to retained earnings (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018
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Cumulative adjustment to retained earnings [Abstract] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 1,937 | $ (329)

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- Definition Cumulative adjustment to retained earnings [Abstract] + References No definition available. + Details
Name: | laws_CumulativeadjustmenttoretainedearningsAbstract
Namespace Prefix: | laws_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant