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Net Income Per Share (Computation of Basic and Diluted Net Income per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Net income      
Net income $ 612,143 $ 364,575 $ 644,513
Net income $ 612,143 $ 364,575 $ 644,513
Shares used in net income per share computation:      
Weighted average shares outstanding - basic (in shares) 156,776 162,302 167,447
Effect of potentially dilutive equivalent shares (in shares) 1,395 1,402 2,967
Weighted average shares outstanding - diluted (in shares) 158,171 163,704 170,414
Net income per share:      
Basic (in dollars per share) $ 3.90 $ 2.25 $ 3.85
Diluted (in dollars per share) $ 3.87 $ 2.23 $ 3.78