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Net Income Per Share - Computations of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income        
Net income $ 170,670 $ 145,483 $ 316,685 $ 287,316
Net income $ 170,670 $ 145,483 $ 316,685 $ 287,316
Shares used in net income per share computation:        
Weighted average shares outstanding - basic (in shares) 147,123 152,460 147,487 152,875
Effect of potentially dilutive equivalent shares (in shares) 1,299 1,212 1,244 1,445
Weighted average shares outstanding - diluted (in shares) 148,422 153,672 148,731 154,320
Net income per share:        
Basic (in dollars per share) $ 1.16 $ 0.95 $ 2.15 $ 1.88
Diluted (in dollars per share) $ 1.15 $ 0.95 $ 2.13 $ 1.86