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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, 2021
Mar. 31, 2020
Mar. 31, 2019
Net Income      
Net income $ 947,257 $ 449,723 $ 257,573
Shares used in net income per share computation:      
Weighted average shares outstanding - basic (in shares) 168,523 166,837 165,609
Effect of potentially dilutive equivalent shares (in shares) 3,252 2,544 3,356
Weighted average shares outstanding - diluted (in shares) 171,775 169,381 168,965
Net income per share:      
Basic (in dollars per share) $ 5.62 $ 2.70 $ 1.56
Diluted (in dollars per share) $ 5.51 $ 2.66 $ 1.52
Anti-dilutive equivalents shares excluded (in shares) 100 1,700 1,800