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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
 3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Net income $ 266,914 $ 72,933 $ 338,987 $ 118,278
Shares used in net income per share computation:        
Weighted average shares outstanding - basic (in shares) 168,645 166,662 168,140 166,484
Effect of potentially dilutive equivalent shares (in shares) 2,737 2,365 2,626 2,430
Weighted average shares outstanding - diluted (in shares) 171,382 169,027 170,766 168,914
Net income per share:        
Basic (in dollars per share) $ 1.58 $ 0.44 $ 2.02 $ 0.71
Diluted (in dollars per share) $ 1.56 $ 0.43 $ 1.99 $ 0.70
Anti-dilutive equivalents shares excluded (in shares) 400 1,900 400 2,000