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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, 2017
Mar. 31, 2016
Mar. 31, 2015
Number of Shares      
Options outstanding, beginning of period (in shares) 5,334 7,876 9,816
Granted (in shares) 0 0 0
Exercised (in shares) (1,784) (746) (390)
Cancelled or expired (in shares) (500) (1,796) (1,550)
Options outstanding, end of period (in shares) 3,050 5,334 7,876
Vested and expected to vest, March 31, 2017 (in shares) 3,050    
Vested and exercisable, March 31, 2017 (in shares) 3,050    
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) 16
Cancelled or expired, Weighted Average Exercise Price (in dollars per share) 23
Options outstanding, end of period, Weighted Average Exercise Price (in dollars per share) 18 $ 18
Vested and expected to vest, March 31, 2017 (in dollars per share) 18    
Vested and exercisable, March 31, 2017 (in dollars per share) $ 18    
Weighted-Average Remaining Contractual Term      
Outstanding, March 31, 2017 3 years 7 months 6 days    
Vested and expected to vest, March 31, 2017 3 years 7 months 6 days    
Vested and exercisable, March 31, 2017 3 years 7 months 6 days    
Aggregate Intrinsic Value      
Exercised $ 14,627 $ 4,026 $ 1,505
Outstanding, March 31, 2017 41,853    
Vested and expected to vest, March 31, 2017 41,853    
Vested and exercisable, March 31, 2017 $ 41,853