Business (Details Textual)	6 Months Ended
Jul. 31, 2011
Entity Wide Revenue Major Customer Number	10.00%

The number of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	lake_EntityWideRevenueMajorCustomerNumber
Namespace Prefix:	lake_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration