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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Net income $ 72,933 $ 64,176 $ 118,278 $ 102,642
Shares used in net income per share computation:        
Weighted average shares outstanding - basic (in shares) 166,662 165,630 166,484 165,474
Effect of potentially dilutive equivalent shares (in shares) 2,365 3,604 2,430 3,522
Weighted average shares outstanding - diluted (in shares) 169,027 169,234 168,914 168,996
Net income per share:        
Basic (in dollars per share) $ 0.44 $ 0.39 $ 0.71 $ 0.62
Diluted (in dollars per share) $ 0.43 $ 0.38 $ 0.70 $ 0.61
Anti-dilutive equivalents shares excluded (in shares) 1,900 800 2,000 1,200