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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 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]        
Net income $ 382,523 $ 117,525 $ 721,510 $ 235,803
Shares used in net income per share computation:        
Weighted average shares outstanding - basic (in shares) 169,050 167,063 168,448 166,678
Effect of potentially dilutive equivalent shares (in shares) 3,537 2,622 2,930 2,495
Weighted average shares outstanding - diluted (in shares) 172,587 169,685 171,378 169,173
Net income per share:        
Basic (in dollars per share) $ 2.26 $ 0.70 $ 4.28 $ 1.41
Diluted (in dollars per share) $ 2.22 $ 0.69 $ 4.21 $ 1.39
Anti-dilutive equivalents shares excluded (in shares) 300 1,800 400 1,800