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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, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]        
Net income $ 117,525 $ 112,810 $ 235,803 $ 215,452
Shares used in net income per share computation:        
Weighted average shares outstanding - basic (in shares) 167,063 165,707 166,678 165,552
Effect of potentially dilutive equivalent shares (in shares) 2,622 3,200 2,495 3,414
Weighted average shares outstanding - diluted (in shares) 169,685 168,907 169,173 168,966
Net income per share:        
Basic (in dollars per share) $ 0.70 $ 0.68 $ 1.41 $ 1.30
Diluted (in dollars per share) $ 0.69 $ 0.67 $ 1.39 $ 1.28
Anti-dilutive equivalents shares excluded (in shares) 1,800 1,300 1,800 1,200