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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, 2020
Mar. 31, 2019
Mar. 31, 2018
Number of Shares      
Options outstanding, beginning of period (in shares) 2,607 2,040 3,050
Granted (in shares) 0 649 0
Exercised (in shares) (573) (82) (994)
Canceled or expired (in shares) (65) 0 (16)
Options outstanding, end of period (in shares) 1,969 2,607 2,040
Vested and exercisable (in shares) 1,530    
Weighted-Average Exercise Price      
Options outstanding, beginning of period, Weighted Average Exercise Price (in dollars per share) $ 20
Granted, Weighted Average Exercise Price (in dollars per share)
Exercised, Weighted Average Exercise Price (in dollars per share) 9
Canceled or expired, Weighted Average Exercise Price (in dollars per share) 39
Options outstanding, end of period, Weighted Average Exercise Price (in dollars per share) 22 $ 20
Vested and exercisable, March 31, 2020 (in dollars per share) $ 18    
Weighted-Average Remaining Contractual Term      
Outstanding, March 31, 2020 4 years 2 months 12 days    
Vested and exercisable, March 31, 2020 2 years 9 months 18 days    
Aggregate Intrinsic Value      
Exercised $ 19,339 $ 1,707 $ 8,347
Outstanding, March 31, 2020 40,549    
Vested and exercisable, March 31, 2020 $ 38,733