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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, 2018
Mar. 31, 2017
Mar. 31, 2016
Number of Shares      
Options outstanding, beginning of period (in shares) 3,050 5,334 7,876
Granted (in shares) 0 0 0
Exercised (in shares) (994) (1,784) (746)
Canceled or expired (in shares) (16) (500) (1,796)
Options outstanding, end of period (in shares) 2,040 3,050 5,334
Vested and exercisable, March 31, 2018 (in shares) 2,040    
Weighted-Average Exercise Price      
Options outstanding, beginning of period, Weighted Average Exercise Price (in dollars per share) $ 18
Granted, Weighted Average Exercise Price (in dollars per share) 0
Exercised, Weighted Average Exercise Price (in dollars per share) 28
Canceled or expired, Weighted Average Exercise Price (in dollars per share) 35
Options outstanding, end of period, Weighted Average Exercise Price (in dollars per share) 14 $ 18
Vested and exercisable, March 31, 2018 (in dollars per share) $ 14    
Weighted-Average Remaining Contractual Term      
Outstanding, March 31, 2018 4 years    
Vested and exercisable, March 31, 2018 4 years    
Aggregate Intrinsic Value      
Exercised $ 8,347 $ 14,627 $ 4,026
Outstanding, March 31, 2018 46,630    
Vested and exercisable, March 31, 2018 $ 46,630