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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 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Net income        
Net income $ 200,147 $ 244,684 $ 487,463 $ 444,528
Net income $ 200,147 $ 244,684 $ 487,463 $ 444,528
Shares used in net income per share computation:        
Weighted average shares outstanding - basic (in shares) 150,647 155,933 152,127 157,568
Effect of potentially dilutive equivalent shares (in shares) 1,248 1,507 1,379 1,275
Weighted average shares outstanding - diluted (in shares) 151,895 157,440 153,506 158,843
Net income per share:        
Basic (in dollars per share) $ 1.33 $ 1.57 $ 3.20 $ 2.82
Diluted (in dollars per share) $ 1.32 $ 1.55 $ 3.18 $ 2.80