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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive (Loss)
Retained Earnings
Common stock, beginning balance (in shares) at Mar. 31, 2021   53,999,000        
Equity, beginning balance at Mar. 31, 2021 $ 1,358,298 $ 540 $ 499,508 $ (130,732) $ (19,801) $ 1,008,783
Treasury stock, beginning balance (in shares) at Mar. 31, 2021       4,088,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 7,331   7,331      
Exercise of stock options (in shares) 191,300 191,000        
Exercise of stock options $ 5,718 $ 1 5,717      
Issuance of shares related to restricted stock (in shares)   160,000        
Issuance of shares related to restricted stock 0 $ 2 (2)      
Treasury share repurchases (in shares)       63,000    
Treasury share repurchases (2,916)     $ (2,916)    
Net income 153,295         153,295
Comprehensive income (loss) (3,406)       (3,406)  
Common stock, ending balance (in shares) at Dec. 31, 2021   54,350,000        
Equity, ending balance at Dec. 31, 2021 1,518,320 $ 543 512,554 $ (133,648) (23,207) 1,162,078
Treasury stock, ending balance (in shares) at Dec. 31, 2021       4,151,000    
Common stock, beginning balance (in shares) at Sep. 30, 2021   54,247,000        
Equity, beginning balance at Sep. 30, 2021 1,461,647 $ 542 507,310 $ (133,648) (24,420) 1,111,863
Treasury stock, beginning balance (in shares) at Sep. 30, 2021       4,151,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 2,234   2,234      
Exercise of stock options (in shares)   103,000        
Exercise of stock options 3,011 $ 1 3,010      
Net income 50,215         50,215
Comprehensive income (loss) 1,213       1,213  
Common stock, ending balance (in shares) at Dec. 31, 2021   54,350,000        
Equity, ending balance at Dec. 31, 2021 1,518,320 $ 543 512,554 $ (133,648) (23,207) 1,162,078
Treasury stock, ending balance (in shares) at Dec. 31, 2021       4,151,000    
Common stock, beginning balance (in shares) at Mar. 31, 2022   54,430,000        
Equity, beginning balance at Mar. 31, 2022 $ 1,577,611 $ 544 515,583 $ (133,648) (19,032) 1,214,164
Treasury stock, beginning balance (in shares) at Mar. 31, 2022 4,151,000     4,151,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 9,756   9,756      
Exercise of stock options (in shares) 200,200 200,000        
Exercise of stock options $ 7,173 $ 2 7,171      
Issuance of shares related to restricted stock (in shares)   222,000        
Issuance of shares related to restricted stock 0 $ 2 (2)      
Treasury share repurchases (in shares)       1,014,000    
Treasury share repurchases (55,466)     $ (55,466)    
Net income 158,246         158,246
Comprehensive income (loss) (10,457)       (10,457)  
Common stock, ending balance (in shares) at Dec. 31, 2022   54,852,000        
Equity, ending balance at Dec. 31, 2022 $ 1,686,863 $ 548 532,508 $ (189,114) (29,489) 1,372,410
Treasury stock, ending balance (in shares) at Dec. 31, 2022 5,165,000     5,165,000    
Common stock, beginning balance (in shares) at Sep. 30, 2022   54,690,000        
Equity, beginning balance at Sep. 30, 2022 $ 1,619,841 $ 547 524,392 $ (189,098) (36,459) 1,320,459
Treasury stock, beginning balance (in shares) at Sep. 30, 2022       5,164,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 2,433   2,433      
Exercise of stock options (in shares)   161,000        
Exercise of stock options 5,684 $ 1 5,683      
Issuance of shares related to restricted stock (in shares)   1,000        
Treasury share repurchases (in shares)       1,000    
Treasury share repurchases (16)     $ (16)    
Net income 51,951         51,951
Comprehensive income (loss) 6,970       6,970  
Common stock, ending balance (in shares) at Dec. 31, 2022   54,852,000        
Equity, ending balance at Dec. 31, 2022 $ 1,686,863 $ 548 $ 532,508 $ (189,114) $ (29,489) $ 1,372,410
Treasury stock, ending balance (in shares) at Dec. 31, 2022 5,165,000     5,165,000