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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, 2022
Mar. 31, 2021
Mar. 31, 2020
Net income      
Net income $ 644,513 $ 947,257 $ 449,723
Shares used in net income per share computation:      
Weighted average shares outstanding - basic (in shares) 167,447 168,523 166,837
Effect of potentially dilutive equivalent shares (in shares) 2,967 3,252 2,544
Weighted average shares outstanding - diluted (in shares) 170,414 171,775 169,381
Net income per share:      
Basic (in dollars per share) $ 3.85 $ 5.62 $ 2.70
Diluted (in dollars per share) $ 3.78 $ 5.51 $ 2.66
Anti-dilutive equivalents shares excluded (in shares) 2,000 100 1,700