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v3.19.1

Leases - Narrative (Details) $ in Thousands | Mar. 31, 2019 USD ($) leases | Mar. 31, 2018 USD ($)
--- | --- | ---
Lessee, Lease, Description [Line Items] |  |
Number of types of leases | leases | 2 |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 1,937 | $ (329)
Retained Earnings [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 1,900 |
Lawson [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Lessee's discount rate | 5.50% |
Bolt [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Lessee's discount rate | 4.20% |

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- Definition Lessee, Operating Lease, Types of Leases + References No definition available. + Details
Name: | laws_LesseeOperatingLeaseTypesofLeases
Namespace Prefix: | laws_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Lessee, Operating Lease and Finance Lease, Discount Rate + References No definition available. + Details
Name: | laws_LesseeOperatingLeaseandFinanceLeaseDiscountRate
Namespace Prefix: | laws_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=laws_LawsonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=laws_BoltMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |