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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
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]    
Net income $ 72,073 $ 45,345
Shares used in net income per share computation:    
Weighted average shares outstanding - basic (in shares) 167,612 166,302
Effect of potentially dilutive equivalent shares (in shares) 2,515 2,495
Weighted average shares outstanding - diluted (in shares) 170,127 168,797
Net income per share:    
Basic (in dollars per share) $ 0.43 $ 0.27
Diluted (in dollars per share) $ 0.42 $ 0.27
Anti-dilutive equivalents shares excluded (in shares) 1,400 2,000