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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 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]        
Net income $ 112,810 $ 80,773 $ 215,452 $ 174,138
Shares used in net income per share computation:        
Weighted average shares outstanding - basic (in shares) 165,707 164,248 165,552 163,924
Effect of potentially dilutive equivalent shares (in shares) 3,200 4,831 3,414 4,908
Weighted average shares outstanding - diluted (in shares) 168,907 169,079 168,966 168,832
Net income per share:        
Basic (in dollars per share) $ 0.68 $ 0.49 $ 1.30 $ 1.06
Diluted (in dollars per share) $ 0.67 $ 0.48 $ 1.28 $ 1.03
Anti-dilutive equivalents shares excluded (in shares) 1,300 500 1,200 1,100