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Employee Benefit Plans (RSU rollforward) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Restricted Stock Units (RSUs)      
Number of Shares      
Outstanding, beginning of period (in shares) 5,221 6,181 5,521
Vested (in shares) (2,148) (2,248) (2,126)
Canceled or expired (in shares) (323) (333) (368)
Outstanding, end of period (in shares) 4,421 5,221 6,181
Weighted-Average Grant Date Fair Value      
Outstanding, beginning of period (in dollars per share) $ 20 $ 14
Vested (in dollars per share) 17
Canceled or expired (in dollars per share) 26
Outstanding, end of period (in dollars per share) $ 29 $ 20 $ 14
Weighted-Average Remaining Vesting Period      
Outstanding, March 31, 2019 1 year 2 months 12 days    
Aggregate Fair Value      
Vested $ 89,159 $ 81,582 $ 48,644
Outstanding, March 31, 2019 $ 173,970    
Time-based RSUs      
Number of Shares      
Granted (in shares) 1,290 1,212 2,390
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share) $ 40 $ 33 $ 16
Market Based RSUs      
Number of Shares      
Granted (in shares)     160
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share)     $ 15
Performance-based RSUs      
Number of Shares      
Granted (in shares)   409 604
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share)   $ 33 $ 15
Market-based and performance-based RSUs      
Number of Shares      
Granted (in shares) 381    
Outstanding, end of period (in shares) 1,100    
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share) $ 39