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Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Detail) - Schedule of Valuation and Qualifying Account (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Allowance for Doubtful Accounts [Member]
      
Valuation Allowances and Reserves, Beginning Balance   $ 10 $ 168
Valuation Allowances and Reserves, Charged to Other Accounts   10 158
Valuation Allowances and Reserves, Ending Balance     10
Valuation Allowance of Deferred Tax Assets [Member]
      
Valuation Allowances and Reserves, Beginning Balance 1,676 1,242 578
Valuation Allowances and Reserves, Charged to Cost and Expense 215 434 664
Valuation Allowances and Reserves, Ending Balance $ 1,891 $ 1,676 $ 1,242