MAJOR SUPPLIER (Details Textual) (Dupount [Member])	12 Months Ended
Jan. 31, 2013	Jan. 31, 2012
Dupount [Member]
Entity Wide Purchases Major Supplier Percentage	11.70%	13.90%

Percentage of purchases from a single external supplier that accounts for 10 percent or more of an entity's purchases.

No definition available.

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