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Employee Benefit Plans (RSU rollforward) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Restricted Stock Units (RSUs)      
Number of Shares      
Outstanding, beginning of period (in shares) 3,951 4,421 5,221
Vested (in shares) (1,444) (1,705) (2,148)
Canceled or expired (in shares) (213) (561) (323)
Outstanding, end of period (in shares) 3,643 3,951 4,421
Weighted-Average Grant Date Fair Value      
Outstanding, beginning of period (in dollars per share) $ 36 $ 29 $ 20
Vested (in dollars per share) 31
Canceled or expired (in dollars per share) 42
Outstanding, end of period (in dollars per share) $ 45 $ 36 $ 29
Weighted-Average Remaining Vesting Period      
Outstanding. end of period (in years) 1 year 2 months 12 days    
Aggregate Fair Value      
Vested $ 168,816 $ 76,389 $ 89,159
Outstanding, March 31, 2021 $ 379,031    
Time-based RSUs      
Number of Shares      
Granted (in shares) 1,046 1,431 1,290
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share) $ 60 $ 38 $ 40
Market-based and performance-based RSUs      
Number of Shares      
Granted (in shares) 303 365 381
Outstanding, end of period (in shares) 900    
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share) $ 67 $ 40 $ 39