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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
Beginning of the period (in shares) at Mar. 31, 2015   173,106   8,625    
Beginning of the period at Mar. 31, 2015 $ 758,134 $ 30,148 $ 0 $ (88,951) $ 930,174 $ (113,237)
Increase (Decrease) in Shareholders' Equity            
Total comprehensive income 120,569       119,317 1,252
Purchases of registered shares (in shares)       4,951    
Purchases of registered shares (70,358)     $ (70,358)    
Tax effects from share-based awards (2,353)   (2,353)      
Sale of shares upon exercise of stock options and purchase rights 19,767   (737) $ 20,504    
Sale of shares upon exercise of options and purchase rights (in shares)       (1,812)    
Issuance of shares upon vesting of restricted stock units (7,247)   (17,645) $ 10,398  
Issuance of shares upon vesting of restricted stock units (in shares)       (1,067)    
Share-based compensation 27,351   27,351      
Cash dividends (85,915)       (85,915)  
End of the period (in shares) at Mar. 31, 2016   173,106   10,697    
End of the period balance at Mar. 31, 2016 759,948 $ 30,148 6,616 $ (128,407) 963,576 (111,985)
Increase (Decrease) in Shareholders' Equity            
Total comprehensive income 217,155       205,876 11,279
Purchases of registered shares (in shares)       4,027    
Purchases of registered shares (83,786)     $ (83,786)    
Tax effects from share-based awards (1,251)   (1,251)      
Sale of shares upon exercise of stock options and purchase rights 39,574   15,403 $ 24,171    
Sale of shares upon exercise of options and purchase rights (in shares)       (2,513)    
Issuance of shares upon vesting of restricted stock units (18,412)   (30,148) $ 13,985 (2,249)  
Issuance of shares upon vesting of restricted stock units (in shares)       (1,484)    
Share-based compensation 35,976   35,976      
Cash dividends (93,093)       (93,093)  
End of the period (in shares) at Mar. 31, 2017   173,106   10,727    
End of the period balance at Mar. 31, 2017 856,111 $ 30,148 26,596 $ (174,037) 1,074,110 (100,706)
Increase (Decrease) in Shareholders' Equity            
Cumulative effect of new accounting principle in period of adoption 57,209   3,297   53,912  
Total comprehensive income 215,793       208,542 7,251
Purchases of registered shares (in shares)       863    
Purchases of registered shares (30,722)     $ (30,722)    
Sale of shares upon exercise of stock options and purchase rights 41,910   21,315 $ 20,595    
Sale of shares upon exercise of options and purchase rights (in shares)       (1,527)    
Issuance of shares upon vesting of restricted stock units (29,813)   (48,291) $ 18,478  
Issuance of shares upon vesting of restricted stock units (in shares)       (1,536)    
Share-based compensation 44,317   44,317      
Cash dividends (104,248)       (104,248)  
End of the period (in shares) at Mar. 31, 2018   173,106   8,527    
End of the period balance at Mar. 31, 2018 $ 1,050,557 $ 30,148 $ 47,234 $ (165,686) $ 1,232,316 $ (93,455)