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Consolidated Statements of Changes in Stockholders' Equity - 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, 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      
Comprehensive (loss) income 99,794       (113) 99,907
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    
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      
Comprehensive (loss) income 66,568       (2,827) 69,395
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    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 8,909   8,909      
Exercise of stock options $ 1,620 $ 0 1,620      
Exercise of stock options (in shares) 55,700 56,000        
Issuance of shares related to restricted stock $ 0 $ 1 (1)      
Issuance of shares related to restricted stock (in shares)   53,000        
Treasury share repurchases (1,075)     $ (1,075)    
Treasury share repurchases (in shares)       21,000    
Comprehensive (loss) income 346,607       7,037 339,570
Balances at Mar. 31, 2018 $ 1,178,610 $ 534 $ 468,783 $ (7,669) $ (19,315) $ 736,277
Common stock (in shares) at Mar. 31, 2018   53,396,000        
Treasury stock (in shares) at Mar. 31, 2018 353,000     353,000