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Inventories, net (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Inventories, net (Textual) [Abstract]
Increase in obsolete and excess inventory reserves	$ 5.4

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- Definition

Increase in obsolete and excess inventory reserves.

+ References

No definition available.

+ Details

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

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- Details

Name:	laws_InventoriesNetTextualAbstract
Namespace Prefix:	laws_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration