Major Supplier (Details Textual) - Jul. 31, 2015	Total	Total
Major Supplier [Line Items]
Entity Wide Purchases Major Supplier Percentage	10.00%	10.00%

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