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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, 2017         $ (34,069)
Comprehensive income $ 72,579        
Ending Balance at Jul. 31, 2017 $ 1,308,813       (23,343)
Ending Balances (in shares) at Jul. 31, 2017 111,280,653        
Beginning Balance at Apr. 30, 2017         (32,269)
Comprehensive income $ 58,841        
Ending Balance at Jul. 31, 2017 $ 1,308,813       (23,343)
Ending Balances (in shares) at Jul. 31, 2017 111,280,653        
Beginning Balance at Jan. 31, 2018 $ 1,300,903 $ 11 $ 684 $ 1,310,859 (10,651)
Beginning Balances (in shares) at Jan. 31, 2018 108,248,568 108,248,568      
Comprehensive income $ 118,119     134,069 (15,950)
Share-based compensation 10,990   10,990    
Share-based awards 13,020   13,020    
Share-based awards (in shares)   860,758      
Cumulative effect of change in accounting pronouncements (see Note 2) 6,564     6,564  
Share repurchases (5,924)   (5,924)    
Share repurchases (in shares)   (158,018)      
Ending Balance at Jul. 31, 2018 $ 1,443,672 $ 11 18,770 1,451,492 (26,601)
Ending Balances (in shares) at Jul. 31, 2018 108,951,308 108,951,308      
Beginning Balance at Apr. 30, 2018         (18,713)
Comprehensive income $ 84,921        
Ending Balance at Jul. 31, 2018 $ 1,443,672 $ 11 $ 18,770 $ 1,451,492 $ (26,601)
Ending Balances (in shares) at Jul. 31, 2018 108,951,308 108,951,308