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Employee Benefit Plans (Stock Option Activity) (Details) - Employee Stock Option - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Number of Shares      
Options outstanding, beginning of period (in shares) 1,969 2,607 2,040
Granted (in shares) 0 0 649
Exercised (in shares) (1,347) (573) (82)
Canceled or expired (in shares) 0 (65) 0
Options outstanding, end of period (in shares) 622 1,969 2,607
Vested and exercisable (in shares) 330    
Weighted-Average Exercise Price      
Options outstanding, beginning of period, Weighted Average Exercise Price (in dollars per share) $ 22
Granted, Weighted Average Exercise Price (in dollars per share)
Exercised, Weighted Average Exercise Price (in dollars per share) 17
Canceled or expired, Weighted Average Exercise Price (in dollars per share) 0
Options outstanding, end of period, Weighted Average Exercise Price (in dollars per share) 34 $ 22
Vested and exercisable (in dollars per share) $ 30    
Weighted-Average Remaining Contractual Term      
Outstanding, March 31, 2021 7 years 1 month 6 days    
Vested and exercisable, March 31, 2021 6 years 3 months 18 days    
Aggregate Intrinsic Value      
Exercised $ 68,596 $ 19,339 $ 1,707
Outstanding, March 31, 2021 43,625    
Vested and exercisable, March 31, 2021 $ 24,452