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Shareholders' Equity - Additional Information (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Feb. 23, 2015
May 27, 2014
Equity, Class of Treasury Stock [Line Items]        
Common shares authorized for repurchase, shares     20,000,000 10,000,000
Remaining common shares authorized for repurchase, shares 5,995,059      
Stock repurchased and retired during period, total cost $ 47,836      
Employee Stock        
Equity, Class of Treasury Stock [Line Items]        
Stock repurchased and retired during period, common shares 55,683 247,124    
Stock repurchased and retired during period, total cost $ 2,049 $ 10,119