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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, 2019
Mar. 31, 2018
Mar. 31, 2017
Number of Shares      
Options outstanding, beginning of period (in shares) 2,040 3,050 5,334
Granted (in shares) 649 0 0
Exercised (in shares) (82) (994) (1,784)
Canceled or expired (in shares) 0 (16) (500)
Options outstanding, end of period (in shares) 2,607 2,040 3,050
Vested and exercisable (in shares) 1,958    
Weighted-Average Exercise Price      
Options outstanding, beginning of period, Weighted Average Exercise Price (in dollars per share) $ 14
Granted, Weighted Average Exercise Price (in dollars per share) 39
Exercised, Weighted Average Exercise Price (in dollars per share) 21
Canceled or expired, Weighted Average Exercise Price (in dollars per share)
Options outstanding, end of period, Weighted Average Exercise Price (in dollars per share) 20 $ 14
Vested and exercisable, March 31, 2019 (in dollars per share) $ 13    
Weighted-Average Remaining Contractual Term      
Outstanding, March 31, 2019 4 years 9 months 18 days    
Vested and exercisable, March 31, 2019 3 years 1 month 6 days    
Aggregate Intrinsic Value      
Exercised $ 1,707 $ 8,347 $ 14,627
Outstanding, March 31, 2019 51,005    
Vested and exercisable, March 31, 2019 $ 50,593