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Consolidated Statements of Changes in Stockholders' Equity and Comprehensive Income - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive (Loss) Income
Retained Earnings (Accumulated Deficit)
Balances at Mar. 31, 2014 $ 563,360 $ 520 $ 414,387 $ (1,431) $ 739 $ 149,145
Common stock (in shares) at Mar. 31, 2014   52,021,000        
Treasury stock (in shares) at Mar. 31, 2014       206,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 6,918   6,918      
Exercise of stock options $ 3,954 $ 4 3,950      
Exercise of stock options (in shares) 386,300 387,000        
Preferred share rights $ 0         0
Issuance of shares related to restricted stock   $ 1 (1)      
Issuance of shares related to restricted stock (in shares)   154,000        
Treasury share repurchases (2,047)     $ (2,047)    
Treasury share repurchases (in shares)       60,000    
Excess tax benefits from share-based awards 1,330   1,330      
Components of comprehensive income:            
Net income 78,260         78,260
Unrecognized net loss on pension plans 0          
Translation adjustments (24,151)       (24,151)  
Comprehensive income 54,109          
Balances at Mar. 31, 2015 627,624 $ 525 426,584 $ (3,478) (23,412) 227,405
Common stock (in shares) at Mar. 31, 2015   52,562,000        
Treasury stock (in shares) at Mar. 31, 2015       266,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 9,954   9,954      
Exercise of stock options $ 6,688 $ 3 6,685      
Exercise of stock options (in shares) 348,000 348,000        
Issuance of shares related to restricted stock $ 1 $ 2 (1)      
Issuance of shares related to restricted stock (in shares)   156,000        
Treasury share repurchases (1,685)     $ (1,685)    
Treasury share repurchases (in shares)       40,000    
Excess tax benefits from share-based awards 1,960   1,960      
Components of comprehensive income:            
Net income 99,907         99,907
Unrecognized net loss on pension plans 0          
Translation adjustments (113)       (113)  
Comprehensive income 99,794          
Balances at Mar. 31, 2016 $ 744,336 $ 530 445,182 $ (5,163) (23,525) 327,312
Common stock (in shares) at Mar. 31, 2016   53,066,000        
Treasury stock (in shares) at Mar. 31, 2016 306,000     306,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 8,148   8,148      
Exercise of stock options $ 4,028 $ 2 4,026      
Exercise of stock options (in shares) 126,800 127,000        
Issuance of shares related to restricted stock $ 0 $ 1 (1)      
Issuance of shares related to restricted stock (in shares)   94,000        
Treasury share repurchases (1,431)     $ (1,431)    
Treasury share repurchases (in shares)       26,000    
Excess tax benefits from share-based awards 900   900      
Components of comprehensive income:            
Net income 69,395          
Unrecognized net loss on pension plans (252)          
Translation adjustments (2,575)          
Comprehensive income 66,568          
Balances at Mar. 31, 2017 $ 822,549 $ 533 $ 458,255 $ (6,594) $ (26,352) $ 396,707
Common stock (in shares) at Mar. 31, 2017   53,287,000        
Treasury stock (in shares) at Mar. 31, 2017 332,000     332,000