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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Shares
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance at Jan. 31, 2016         $ (23,451)
Comprehensive income $ 139,636        
Ending Balance at Oct. 31, 2016 $ 1,247,633       (37,647)
Ending Balances (in shares) at Oct. 31, 2016 116,233,584        
Beginning Balance at Jul. 31, 2016         (26,927)
Comprehensive income $ 36,635        
Ending Balance at Oct. 31, 2016 $ 1,247,633       (37,647)
Ending Balances (in shares) at Oct. 31, 2016 116,233,584        
Beginning Balance at Jan. 31, 2017 $ 1,313,084 $ 12   $ 1,347,141 (34,069)
Beginning Balances (in shares) at Jan. 31, 2017 116,233,781 116,233,781      
Comprehensive income $ 116,270     106,945 9,325
Share-based compensation 13,831   $ 13,831    
Stock options and awards (in shares)   200,000      
Cumulative effect of change in accounting pronouncement 847   1,607 (760)  
Share repurchases (159,224) $ (1) $ (15,438) (143,785)  
Share repurchases (in shares)   (8,185,310)      
Ending Balance at Oct. 31, 2017 $ 1,284,808 $ 11   1,309,541 (24,744)
Ending Balances (in shares) at Oct. 31, 2017 108,248,471 108,248,471      
Beginning Balance at Jul. 31, 2017         (23,343)
Comprehensive income $ 43,691        
Ending Balance at Oct. 31, 2017 $ 1,284,808 $ 11   $ 1,309,541 $ (24,744)
Ending Balances (in shares) at Oct. 31, 2017 108,248,471 108,248,471