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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
Beginning of the period (in shares) at Mar. 31, 2016   173,106   10,697    
Beginning of the period at Mar. 31, 2016 $ 759,948 $ 30,148 $ 6,616 $ (128,407) $ 963,576 $ (111,985)
Increase (Decrease) in Shareholders' Equity            
Total comprehensive income $ 72,856       68,986 3,870
Purchase of registered shares (in shares) 2,400     2,441    
Purchases of registered shares $ (42,894)     $ (42,894)    
Tax effects from share-based awards (1,138)   (1,138)      
Sales of shares upon exercise of stock options and purchase rights 14,484   4,556 $ 9,928    
Sales of shares upon exercise of options and purchase rights (in shares)       (1,100)    
Issuance of shares upon vesting of restricted stock units (11,047)   (18,101) $ 9,303 (2,249)  
Issuance of shares upon vesting of restricted stock units (in shares)       (1,029)    
Share-based compensation expense 16,918   16,918      
Cash dividends (93,093)       (93,093)  
End of the period (in shares) at Sep. 30, 2016   173,106   11,009    
End of the period at Sep. 30, 2016 716,034 $ 30,148 8,851 $ (152,070) 937,220 (108,115)
Increase (Decrease) in Shareholders' Equity            
Cumulative effect of adoption of new accounting standard (Note 1) 57,205   3,293   53,912  
Beginning of the period (in shares) at Mar. 31, 2017   173,106   10,727    
Beginning of the period at Mar. 31, 2017 856,111 $ 30,148 26,596 $ (174,037) 1,074,110 (100,706)
Increase (Decrease) in Shareholders' Equity            
Total comprehensive income $ 95,268       93,365 1,903
Purchase of registered shares (in shares) 300     307    
Purchases of registered shares $ (10,682)     $ (10,682)    
Sales of shares upon exercise of stock options and purchase rights 30,000   15,628 $ 14,372    
Sales of shares upon exercise of options and purchase rights (in shares)       (1,084)    
Issuance of shares upon vesting of restricted stock units (23,706)   (37,464) $ 13,758 0  
Issuance of shares upon vesting of restricted stock units (in shares)       (1,205)    
Share-based compensation expense 21,887   21,887      
Cash dividends (104,248)       (104,248)  
End of the period (in shares) at Sep. 30, 2017   173,106   8,745    
End of the period at Sep. 30, 2017 $ 921,835 $ 30,148 $ 29,940 $ (156,589) $ 1,117,139 $ (98,803)