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Condensed Consolidated Statement of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Shares
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance at Jan. 31, 2015         $ (15,427)
Comprehensive income $ 154,387        
Ending Balance at Oct. 31, 2015 $ 1,171,669       (12,651)
Ending Balances (in shares) at Oct. 31, 2015 121,545,740        
Beginning Balance at Jul. 31, 2015         (9,992)
Comprehensive income $ 49,335        
Ending Balance at Oct. 31, 2015 $ 1,171,669       (12,651)
Ending Balances (in shares) at Oct. 31, 2015 121,545,740        
Beginning Balance at Jan. 31, 2016 $ 1,137,227 $ 12   $ 1,160,666 (23,451)
Beginning Balances (in shares) at Jan. 31, 2016 117,321,120 117,321,120      
Comprehensive income $ 139,636     153,832 (14,196)
Share-based compensation 20,032   $ 20,032    
Stock options and awards (in shares)   292,847      
Stock options and awards 4,096   4,096    
Excess tax deficiencies from share-based awards, net (5,522)   (5,522)    
Share repurchases (in shares)   (1,380,383)      
Share repurchases (47,836)   $ (18,606) (29,230)  
Ending Balance at Oct. 31, 2016 $ 1,247,633 $ 12   1,285,268 (37,647)
Ending Balances (in shares) at Oct. 31, 2016 116,233,584 116,233,584      
Beginning Balance at Jul. 31, 2016         (26,927)
Comprehensive income $ 36,635        
Ending Balance at Oct. 31, 2016 $ 1,247,633 $ 12   $ 1,285,268 $ (37,647)
Ending Balances (in shares) at Oct. 31, 2016 116,233,584 116,233,584