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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Registered Shares
Additional Paid-in Capital
Treasury Shares
Retained Earnings
Accumulated Other Comprehensive Loss
Cumulative Effect, Period of Adoption, Adjustment
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings
Beginning of the period at Mar. 31, 2019 $ 1,176,339 $ 30,148 $ 56,655 $ (169,802) $ 1,365,036 $ (105,698)    
Beginning of the period (in shares) at Mar. 31, 2019   173,106   7,244        
Increase (Decrease) in Shareholders' Equity                
Total comprehensive income 232,009       235,803 (3,794)    
Purchases of registered shares (15,127)     $ (15,127)        
Purchase of registered shares (in shares)       389        
Sales of shares upon exercise of stock options and purchase rights 11,540   2,607 $ 8,933        
Sales of shares upon exercise of stock options and purchase rights (in shares)       (604)        
Issuance of shares upon vesting of restricted stock units (23,096)   (39,902) $ 16,806        
Issuance of shares upon vesting of restricted stock units (in shares)       (1,128)        
Share-based compensation 40,308   40,308          
Cash dividends (124,180)       (124,180)      
End of the period at Dec. 31, 2019 1,297,793 $ 30,148 59,668 $ (159,190) 1,476,659 (109,492)    
End of the period (in shares) at Dec. 31, 2019   173,106   5,901        
Beginning of the period at Sep. 30, 2019 1,167,537 $ 30,148 50,913 $ (163,728) 1,359,134 (108,930)    
Beginning of the period (in shares) at Sep. 30, 2019   173,106   6,203        
Increase (Decrease) in Shareholders' Equity                
Total comprehensive income 116,963       117,525 (562)    
Sales of shares upon exercise of stock options and purchase rights 1,640   (1,551) $ 3,191        
Sales of shares upon exercise of stock options and purchase rights (in shares)       (213)        
Issuance of shares upon vesting of restricted stock units (2,188)   (3,535) $ 1,347        
Issuance of shares upon vesting of restricted stock units (in shares)       (89)        
Share-based compensation 13,841   13,841          
End of the period at Dec. 31, 2019 1,297,793 $ 30,148 59,668 $ (159,190) 1,476,659 (109,492)    
End of the period (in shares) at Dec. 31, 2019   173,106   5,901        
Beginning of the period at Mar. 31, 2020 1,489,268 $ 30,148 75,097 $ (185,896) 1,690,579 (120,660) $ (553) $ (553)
Beginning of the period (in shares) at Mar. 31, 2020   173,106   6,210        
Increase (Decrease) in Shareholders' Equity                
Total comprehensive income 739,253       721,510 17,743    
Purchases of registered shares (72,725)     $ (72,725)        
Purchase of registered shares (in shares)       915        
Sales of shares upon exercise of stock options and purchase rights 29,709   (1,368) $ 31,077        
Sales of shares upon exercise of stock options and purchase rights (in shares)       (1,461)        
Issuance of shares upon vesting of restricted stock units (29,475)   (48,968) $ 19,493        
Issuance of shares upon vesting of restricted stock units (in shares)       (1,031)        
Issuance of shares for contingent consideration 28,463   18,847 $ 9,616        
Issuance of shares for contingent consideration (in shares)       (390)        
Share-based compensation 64,532   64,532          
Cash dividends (146,705)       (146,705)      
End of the period at Dec. 31, 2020 2,101,767 $ 30,148 108,140 $ (198,435) 2,264,831 (102,917)    
End of the period (in shares) at Dec. 31, 2020   173,106   4,243        
Beginning of the period at Sep. 30, 2020 1,705,963 $ 30,148 78,617 $ (166,258) 1,882,308 (118,852)    
Beginning of the period (in shares) at Sep. 30, 2020   173,106   4,357        
Increase (Decrease) in Shareholders' Equity                
Total comprehensive income 398,458       382,523 15,935    
Purchases of registered shares (50,271)     $ (50,271)        
Purchase of registered shares (in shares)       603        
Sales of shares upon exercise of stock options and purchase rights 3,643   (2,733) $ 6,376        
Sales of shares upon exercise of stock options and purchase rights (in shares)       (250)        
Issuance of shares upon vesting of restricted stock units (3,731)   (5,833) $ 2,102        
Issuance of shares upon vesting of restricted stock units (in shares)       (77)        
Issuance of shares for contingent consideration 28,463   18,847 $ 9,616        
Issuance of shares for contingent consideration (in shares)       (390)        
Share-based compensation 19,242   19,242          
End of the period at Dec. 31, 2020 $ 2,101,767 $ 30,148 $ 108,140 $ (198,435) $ 2,264,831 $ (102,917)    
End of the period (in shares) at Dec. 31, 2020   173,106   4,243