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Leases - Cash Outflows of the Leasing Activity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 3,014
Operating cash flow from financing leases	14
Financing cash flow from financing leases	$ 192

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- Definition

Financing cash flow from financing leases

+ References

No definition available.

+ Details

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Namespace Prefix:	laws_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration