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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, 2020
Mar. 31, 2019
Mar. 31, 2018
Net Income      
Net income $ 449,723 $ 257,573 $ 208,542
Shares used in net income per share computation:      
Weighted average shares outstanding - basic (in shares) 166,837 165,609 164,038
Effect of potentially dilutive equivalent shares (in shares) 2,544 3,356 4,933
Weighted average shares outstanding - diluted (in shares) 169,381 168,965 168,971
Net income per share:      
Basic (in dollars per share) $ 2.70 $ 1.56 $ 1.27
Diluted (in dollars per share) $ 2.66 $ 1.52 $ 1.23
Anti-dilutive equivalents shares excluded (in shares) 1,700 1,800 1,100