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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 Income (Loss)
Retained Earnings
Common stock, beginning balance (in shares) at Mar. 31, 2020   53,805,000        
Equity, beginning balance at Mar. 31, 2020 $ 1,170,971 $ 538 $ 488,116 $ (117,623) $ (44,161) $ 844,101
Treasury stock, beginning balance (in shares) at Mar. 31, 2020       3,719,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 4,356   4,356      
Exercise of stock options (in shares) 62,800 62,000        
Exercise of stock options $ 1,285   1,285      
Issuance of shares related to restricted stock   74,000        
Issuance of shares related to restricted stock 0 $ 1 (1)      
Treasury share repurchases       60,000    
Treasury share repurchases (2,239)     $ (2,239)    
Net income 88,295         88,295
Comprehensive income (loss) 15,549       15,549  
Common stock, ending balance (in shares) at Sep. 30, 2020   53,941,000        
Equity, ending balance at Sep. 30, 2020 1,278,217 $ 539 493,756 $ (119,862) (28,612) 932,396
Treasury stock, ending balance (in shares) at Sep. 30, 2020       3,779,000    
Common stock, beginning balance (in shares) at Jun. 30, 2020   53,939,000        
Equity, beginning balance at Jun. 30, 2020 1,227,014 $ 539 490,795 $ (118,865) (33,262) 887,807
Treasury stock, beginning balance (in shares) at Jun. 30, 2020       3,750,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 2,892   2,892      
Exercise of stock options (in shares)   2,000        
Exercise of stock options 69   69      
Treasury share repurchases       29,000    
Treasury share repurchases (997)     $ (997)    
Net income 44,589         44,589
Comprehensive income (loss) 4,650       4,650  
Common stock, ending balance (in shares) at Sep. 30, 2020   53,941,000        
Equity, ending balance at Sep. 30, 2020 1,278,217 $ 539 493,756 $ (119,862) (28,612) 932,396
Treasury stock, ending balance (in shares) at Sep. 30, 2020       3,779,000    
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     4,088,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 5,097   5,097      
Exercise of stock options (in shares) 87,600 88,000        
Exercise of stock options $ 2,707   2,707      
Issuance of shares related to restricted stock   160,000        
Issuance of shares related to restricted stock 0 $ 2 (2)      
Treasury share repurchases       63,000    
Treasury share repurchases (2,916)     $ (2,916)    
Net income 103,080         103,080
Comprehensive income (loss) (4,619)       (4,619)  
Common stock, ending balance (in shares) at Sep. 30, 2021   54,247,000        
Equity, ending balance at Sep. 30, 2021 $ 1,461,647 $ 542 507,310 $ (133,648) (24,420) 1,111,863
Treasury stock, ending balance (in shares) at Sep. 30, 2021 4,151,000     4,151,000    
Common stock, beginning balance (in shares) at Jun. 30, 2021   54,211,000        
Equity, beginning balance at Jun. 30, 2021 $ 1,416,247 $ 542 503,588 $ (133,648) (20,773) 1,066,538
Treasury stock, beginning balance (in shares) at Jun. 30, 2021       4,151,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 3,219   3,219      
Exercise of stock options (in shares)   20,000        
Exercise of stock options 503   503      
Issuance of shares related to restricted stock   16,000        
Net income 45,325         45,325
Comprehensive income (loss) (3,647)       (3,647)  
Common stock, ending balance (in shares) at Sep. 30, 2021   54,247,000        
Equity, ending balance at Sep. 30, 2021 $ 1,461,647 $ 542 $ 507,310 $ (133,648) $ (24,420) $ 1,111,863
Treasury stock, ending balance (in shares) at Sep. 30, 2021 4,151,000     4,151,000