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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net income        
Net income $ 137,117 $ 82,091 $ 199,844 $ 182,927
Net income $ 137,117 $ 82,091 $ 199,844 $ 182,927
Shares used in net income per share computation:        
Weighted average shares outstanding - basic (in shares) 157,911 163,186 158,385 163,937
Effect of potentially dilutive equivalent shares (in shares) 1,023 1,142 1,160 1,434
Weighted average shares outstanding - diluted (in shares) 158,934 164,328 159,545 165,371
Net income per share:        
Basic (in dollars per share) $ 0.87 $ 0.50 $ 1.26 $ 1.12
Diluted (in dollars per share) $ 0.86 $ 0.50 $ 1.25 $ 1.11