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Derivative INSTRUMENTS AND FOREIGN CURRENCY EXPOSURE (Details Textual) (USD $) | 12 Months Ended
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Jan. 31, 2013 | Jan. 31, 2012
Foreign Currency Transaction Loss, before Tax | $ 741,052 | $ 304,626
Foreign Currency Transaction Gain Loss Before Tax Price Per Share (in dollars per share) | $ 0.14 | $ 0.05

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- Definition This element represents that, the percentage of the aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. + References No definition available. + Details
Name: | lake_ForeignCurrencyTransactionGainLossBeforeTaxPricePerShare
Namespace Prefix: | lake_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate realized and unrealized loss on foreign currency transactions included in net income. Includes loss on a foreign currency forward exchange contract. Does not include foreign currency transactions designated as hedges of net investment in a foreign entity or intercompany foreign currency transactions that are of a long-term nature. Gross of tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 15, 20, 30 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
Name: | us-gaap_ForeignCurrencyTransactionLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration