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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, 2022
Mar. 31, 2021
Mar. 31, 2020
Number of Shares      
Options outstanding, beginning of period (in shares) 622 1,969 2,607
Granted (in shares) 842    
Exercised (in shares) (71) (1,347) (573)
Canceled or expired (in shares)     (65)
Options outstanding, end of period (in shares) 1,393 622 1,969
Vested and exercisable (in shares) 551    
Weighted-Average Exercise Price      
Beginning of period (in dollars per share) $ 34
Granted (in dollars per share) 80    
Exercised (in dollars per share) 39
Canceled or expired (in dollars per share)    
End of period (in dollars per share) 62 $ 34
Vested and exercisable (in dollars per share) $ 34    
Weighted-Average Remaining Contractual Term      
Outstanding, March 31, 2022 8 years 3 months 18 days 7 years 1 month 6 days  
Vested and exercisable, March 31, 2022 6 years    
Aggregate Intrinsic Value      
Exercised $ 5,573 $ 68,596 $ 19,339
Outstanding, March 31, 2022 21,830 $ 43,625  
Vested and exercisable, March 31, 2022 $ 22,006