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Shareholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 08, 2015
Oct. 31, 2015
Oct. 31, 2015
Oct. 31, 2014
Jan. 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
Stock repurchased and retired during period, common shares   3,699,949 8,455,621        
Stock repurchased and retired during period, total cost   $ 111,909 $ 282,701        
Average cost per share   $ 30.25 $ 33.43        
Additional paid-in-capital reduction related to shares repurchased   $ 0 $ 0        
Retained earnings reduction related to shares repurchased   $ (108,913) $ (310,686)        
Subsequent Event              
Equity, Class of Treasury Stock [Line Items]              
Stock repurchased and retired during period, common shares 4,224,620            
Stock repurchased and retired during period, total cost $ 99,734,998            
Average cost per share $ 23.61            
Employee Stock              
Equity, Class of Treasury Stock [Line Items]              
Stock repurchased and retired during period, common shares     247,124 83,894      
Stock repurchased and retired during period, total cost     $ 10,119 $ 3,094      
New Share Repurchase Program              
Equity, Class of Treasury Stock [Line Items]              
Stock repurchased and retired during period, common shares     2,281,469   7,718,531    
Stock repurchased and retired during period, total cost     $ 82,826   $ 258,160    
Average cost per share     $ 36.30   $ 33.45