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Net Income Per Share - Computations 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, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Earnings Per Share [Abstract]        
Net income $ 210,011 $ 382,523 $ 536,308 $ 721,510
Shares used in net income per share computation:        
Weighted average shares outstanding - basic (in shares) 167,090 169,050 167,953 168,448
Effect of potentially dilutive equivalent shares (in shares) 2,617 3,537 3,074 2,930
Weighted average shares outstanding - diluted (in shares) 169,707 172,587 171,027 171,378
Net income per share:        
Basic (in dollars per share) $ 1.26 $ 2.26 $ 3.19 $ 4.28
Diluted (in dollars per share) $ 1.24 $ 2.22 $ 3.14 $ 4.21
Anti-dilutive equivalents shares excluded (in shares) 800 300 900 400