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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 115,046       118,278 (3,232)    
Purchases of registered shares (15,127)     $ (15,127)        
Purchase of registered shares (in shares)       389        
Issuance of shares upon vesting of restricted stock units 9,900   4,158 $ 5,742        
Sales of shares upon exercise of stock options and purchase rights (in shares)       (391)        
Issuance of shares upon vesting of restricted stock units (20,908)   (36,367) $ 15,459        
Issuance of shares upon vesting of restricted stock units (in shares)       (1,039)        
Share-based compensation 26,467   26,467          
Cash dividends (in dollars per share) (124,180)       (124,180)      
End of the period at Sep. 30, 2019 1,167,537 $ 30,148 50,913 $ (163,728) 1,359,134 (108,930)    
End of the period (in shares) at Sep. 30, 2019   173,106   6,203        
Beginning of the period at Jun. 30, 2019 1,198,034 $ 30,148 35,048 $ (170,140) 1,410,381 (107,403)    
Beginning of the period (in shares) at Jun. 30, 2019   173,106   6,642        
Increase (Decrease) in Shareholders' Equity                
Total comprehensive income 71,406       72,933 (1,527)    
Issuance of shares upon vesting of restricted stock units 9,507   4,150 $ 5,357        
Sales of shares upon exercise of stock options and purchase rights (in shares)       (366)        
Issuance of shares upon vesting of restricted stock units (1,538)   (2,593) $ 1,055        
Issuance of shares upon vesting of restricted stock units (in shares)       (73)        
Share-based compensation 14,308   14,308          
Cash dividends (in dollars per share) (124,180)       (124,180)      
End of the period at Sep. 30, 2019 1,167,537 $ 30,148 50,913 $ (163,728) 1,359,134 (108,930)    
End of the period (in shares) at Sep. 30, 2019   173,106   6,203        
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 340,795       338,987 1,808    
Purchases of registered shares (22,454)     $ (22,454)        
Purchase of registered shares (in shares)       312        
Issuance of shares upon vesting of restricted stock units 26,066   1,365 $ 24,701        
Sales of shares upon exercise of stock options and purchase rights (in shares)       (1,211)        
Issuance of shares upon vesting of restricted stock units (25,744)   (43,135) $ 17,391        
Issuance of shares upon vesting of restricted stock units (in shares)       (954)        
Share-based compensation 45,290   45,290          
Cash dividends (in dollars per share) (146,705)       (146,705)      
End of the period at Sep. 30, 2020 1,705,963 $ 30,148 78,617 $ (166,258) 1,882,308 (118,852)    
End of the period (in shares) at Sep. 30, 2020   173,106   4,357        
Beginning of the period at Jun. 30, 2020 1,567,481 $ 30,148 54,668 $ (158,463) 1,762,099 (120,971)    
Beginning of the period (in shares) at Jun. 30, 2020   173,106   4,689        
Increase (Decrease) in Shareholders' Equity                
Total comprehensive income 269,033       266,914 2,119    
Purchases of registered shares (22,454)     $ (22,454)        
Purchase of registered shares (in shares)       312        
Issuance of shares upon vesting of restricted stock units 16,074   3,255 $ 12,819        
Sales of shares upon exercise of stock options and purchase rights (in shares)       (568)        
Issuance of shares upon vesting of restricted stock units (2,623)   (4,463) $ 1,840        
Issuance of shares upon vesting of restricted stock units (in shares)       (76)        
Share-based compensation 25,157   25,157          
Cash dividends (in dollars per share) (146,705)       (146,705)      
End of the period at Sep. 30, 2020 $ 1,705,963 $ 30,148 $ 78,617 $ (166,258) $ 1,882,308 $ (118,852)    
End of the period (in shares) at Sep. 30, 2020   173,106   4,357