XML 49 R33.htm IDEA: XBRL DOCUMENT v2.4.0.8
Shareholders' Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2013
Oct. 31, 2013
Aug. 27, 2013
Equity, Class of Treasury Stock [Line Items]      
Common shares authorized for repurchase, shares     10,000,000
Stock settled and retired during period, common shares   300,300  
Stock repurchased and retired during period, total cost $ 10,694 $ 10,694  
Average cost per share $ 35.61 $ 35.61  
Employee Stock
      
Equity, Class of Treasury Stock [Line Items]      
Stock settled and retired during period, common shares   9,178  
Stock repurchased and retired during period, total cost   $ 385