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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ 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, 2024   173,106,000        
Beginning of the period at Mar. 31, 2024 $ 2,233,653 $ 30,148 $ 63,524 $ (1,351,336) $ 3,602,519 $ (111,202)
Beginning of the period (in shares) at Mar. 31, 2024       19,243,000    
Increase (Decrease) in Shareholders' Equity            
Total comprehensive income 299,146       287,316 11,830
Purchases of registered shares (in shares)       2,900,000    
Purchases of registered shares (262,119)     $ (262,119)    
Sales of shares upon exercise of stock options and purchase rights 20,235   (6,065) $ 29,567 (3,267)  
Sales of shares upon exercise of stock options and purchase rights (in shares)       (273,000)    
Issuance of shares upon vesting of restricted stock units (in shares)       (600,000)    
Issuance of shares upon vesting of restricted stock units (21,243)   (35,394) $ 65,739 (51,588)  
Share-based compensation 50,203   50,203      
Cash dividends (207,981)       (207,981)  
End of the period (in shares) at Sep. 30, 2024   173,106,000        
End of the period at Sep. 30, 2024 2,111,894 $ 30,148 72,268 $ (1,518,149) 3,626,999 (99,372)
End of the period (in shares) at Sep. 30, 2024       21,270,000    
Beginning of the period (in shares) at Jun. 30, 2024   173,106,000        
Beginning of the period at Jun. 30, 2024 2,248,935 $ 30,148 57,036 $ (1,418,051) 3,695,574 (115,772)
Beginning of the period (in shares) at Jun. 30, 2024       20,090,000    
Increase (Decrease) in Shareholders' Equity            
Total comprehensive income 161,883       145,483 16,400
Purchases of registered shares (in shares)       1,456,000    
Purchases of registered shares (129,987)     $ (129,987)    
Sales of shares upon exercise of stock options and purchase rights 15,617   (4,526) $ 23,410 (3,267)  
Sales of shares upon exercise of stock options and purchase rights (in shares)       (216,000)    
Issuance of shares upon vesting of restricted stock units (in shares)       (60,000)    
Issuance of shares upon vesting of restricted stock units (2,390)   (6,059) $ 6,479 (2,810)  
Share-based compensation 25,817   25,817      
Cash dividends (207,981)       (207,981)  
End of the period (in shares) at Sep. 30, 2024   173,106,000        
End of the period at Sep. 30, 2024 2,111,894 $ 30,148 72,268 $ (1,518,149) 3,626,999 (99,372)
End of the period (in shares) at Sep. 30, 2024       21,270,000    
Beginning of the period (in shares) at Mar. 31, 2025   168,994,000        
Beginning of the period at Mar. 31, 2025 $ 2,127,420 $ 29,432 82,591 $ (1,464,912) 3,627,261 (146,952)
Beginning of the period (in shares) at Mar. 31, 2025 20,485,000     20,485,000    
Increase (Decrease) in Shareholders' Equity            
Total comprehensive income $ 337,143       316,685 20,458
Purchases of registered shares (in shares)       2,471,000    
Purchases of registered shares (215,802)     $ (215,802)    
Sales of shares upon exercise of stock options and purchase rights 21,713   (2,792) $ 24,505    
Sales of shares upon exercise of stock options and purchase rights (in shares)       (274,000)    
Issuance of shares upon vesting of restricted stock units (in shares)       (583,000)    
Issuance of shares upon vesting of restricted stock units (18,211)   (57,931) $ 53,427 (13,707)  
Cancellation of treasury shares (in shares)   (8,210,000)   (8,210,000)    
Cancellation of treasury shares 0 $ (1,431)   $ 712,165 (710,734)  
Share-based compensation 63,479   63,479      
Cash dividends (232,729)       (232,729)  
End of the period (in shares) at Sep. 30, 2025   160,784,000        
End of the period at Sep. 30, 2025 $ 2,083,013 $ 28,001 85,347 $ (890,617) 2,986,776 (126,494)
End of the period (in shares) at Sep. 30, 2025 13,889,105     13,889,000    
Beginning of the period (in shares) at Jun. 30, 2025   168,994,000        
Beginning of the period at Jun. 30, 2025 $ 2,187,252 $ 29,432 64,604 $ (1,536,190) 3,759,569 (130,163)
Beginning of the period (in shares) at Jun. 30, 2025       21,443,000    
Increase (Decrease) in Shareholders' Equity            
Total comprehensive income 174,339       170,670 3,669
Purchases of registered shares (in shares)       940,000    
Purchases of registered shares (91,667)     $ (91,667)    
Sales of shares upon exercise of stock options and purchase rights 18,451   (2,313) $ 20,764    
Sales of shares upon exercise of stock options and purchase rights (in shares)       (233,000)    
Issuance of shares upon vesting of restricted stock units (in shares)       (51,000)    
Issuance of shares upon vesting of restricted stock units $ (2,173)   (6,484) $ 4,311    
Cancellation of treasury shares (in shares) (8,210,000)     (8,210,000)    
Cancellation of treasury shares $ 0 $ (1,431)   $ 712,165 (710,734)  
Share-based compensation 29,540   29,540      
Cash dividends (232,729)       (232,729)  
End of the period (in shares) at Sep. 30, 2025   160,784,000        
End of the period at Sep. 30, 2025 $ 2,083,013 $ 28,001 $ 85,347 $ (890,617) $ 2,986,776 $ (126,494)
End of the period (in shares) at Sep. 30, 2025 13,889,105     13,889,000