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Shareholders' Equity - Aggregated Information Regarding Stock Options Granted (Detail) (USD $)
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance, Number of Shares 916,612  
Options Granted, Number of Shares 56,800  
Options Exercised, Number of Shares (210,790) (66,313)
Options Expired, Number of Shares (25,975)  
Ending balance, Number of Shares 736,647 916,612
Options Exercisable, Number of Shares 570,324  
Beginning balance, Weighted Average Option Price Per Share $ 8.46  
Options Granted, Weighted Average Option Price Per Share $ 10.54  
Options Exercised, Weighted Average Option Price Per Share $ 8.33  
Options Expired, Weighted Average Option Price Per Share $ 9.42  
Ending balance, Weighted Average Option Price Per Share $ 8.63 $ 8.46
Options Exercisable, Weighted Average Option Price Per Share $ 8.57  
Range One [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding, Option Price Per Share, Lower range, Ending balance   $ 2.40
Options Outstanding, Option Price Per Share, Upper range, Ending balance   $ 11.90
Range Two [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Granted, Option Price Per Share, Lower range $ 10.50  
Options Granted, Option Price Per Share, Upper range $ 10.60  
Range Three [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Exercised, Option Price Per Share, Lower range $ 2.40  
Options Exercised, Option Price Per Share, Upper range $ 11.90  
Range Four [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Expired, Option Price Per Share, Lower range $ 2.40  
Options Expired, Option Price Per Share, Upper range $ 11.90  
Range Five [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding, Option Price Per Share, Lower range, Ending balance $ 5.78  
Options Outstanding, Option Price Per Share, Upper range, Ending balance $ 11.90  
Range Six [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Exercisable, Option Price Per Share, Lower range $ 5.78  
Options Exercisable, Option Price Per Share, Upper range $ 11.90