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Summary of Restricted Stock Unit's Activity (Detail) (Restricted Stock Units (RSUs), USD $)
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Restricted Stock Units (RSUs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested awards outstanding at beginning of year, Shares 10,666    
Granted, Shares       
Vested, Shares       
Exercised, Shares       
Forfeited / Cancelled, Shares (10,666)    
Non-vested awards outstanding at end of year, Shares   10,666  
Non-vested awards outstanding at beginning of year, Weighted average fair value $ 21.11    
Granted, Weighted average fair value    $ 20.08 $ 36.64
Vested, Weighted average fair value       
Exercised, Weighted average fair value       
Forfeited / Cancelled, Weighted average fair value $ 21.11    
Non-vested awards outstanding at end of year, Weighted average fair value   $ 21.11