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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
Beginning balance, common stock (in shares) at Mar. 31, 2017   53,287,000        
Beginning balance, treasury stock (in shares) at Mar. 31, 2017       332,000    
Beginning balance at Mar. 31, 2017 $ 822,549 $ 533 $ 458,255 $ (6,594) $ (26,352) $ 396,707
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 8,909   8,909      
Exercise of stock options (in shares) 55,700 56,000        
Exercise of stock options $ 1,620 $ 0 1,620      
Issuance of shares related to restricted stock (in shares)   53,000        
Issuance of shares related to restricted stock   $ 1 (1)      
Treasury share repurchases (in shares)       21,000    
Treasury share repurchases (1,075)     $ (1,075)    
Net income (loss) 339,570         339,570
Other comprehensive income (loss) 7,037       7,037  
Ending balance, common stock (in shares) at Mar. 31, 2018   53,396,000        
Ending balance, treasury stock (in shares) at Mar. 31, 2018       353,000    
Ending balance at Mar. 31, 2018 1,178,610 $ 534 468,783 $ (7,669) (19,315) 736,277
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 7,438   7,438      
Exercise of stock options (in shares) 97,700 98,000        
Exercise of stock options $ 2,931 $ 0 2,931      
Issuance of shares related to restricted stock (in shares)   176,000        
Issuance of shares related to restricted stock   $ 2 (2)      
Treasury share repurchases (in shares)       1,518,000    
Treasury share repurchases (52,259)     $ (52,259)    
Net income (loss) (35,800)         (35,800)
Other comprehensive income (loss) $ (6,432)       (6,432)  
Ending balance, common stock (in shares) at Mar. 31, 2019   53,670,000        
Ending balance, treasury stock (in shares) at Mar. 31, 2019 1,871,000     1,871,000    
Ending balance at Mar. 31, 2019 $ 1,095,831 $ 536 479,150 $ (59,928) (25,747) 701,820
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 7,644   7,644      
Exercise of stock options (in shares) 47,900 48,000        
Exercise of stock options $ 1,324 $ 1 1,323      
Issuance of shares related to restricted stock (in shares)   87,000        
Issuance of shares related to restricted stock   $ 1 (1)      
Treasury share repurchases (in shares)       1,848,000    
Treasury share repurchases (57,695)     $ (57,695)    
Net income (loss) 142,281         142,281
Other comprehensive income (loss) $ (18,414)       (18,414)  
Ending balance, common stock (in shares) at Mar. 31, 2020   53,805,000        
Ending balance, treasury stock (in shares) at Mar. 31, 2020 3,719,000     3,719,000    
Ending balance at Mar. 31, 2020 $ 1,170,971 $ 538 $ 488,116 $ (117,623) $ (44,161) $ 844,101