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Employee Benefit Plans (RSU rollforward) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Restricted Stock Units (RSUs)      
Number of Shares      
Outstanding, beginning of period (in shares) 3,643 3,951 4,421
Vested (in shares) (1,463) (1,444) (1,705)
Canceled or expired (in shares) (205) (213) (561)
Outstanding, end of period (in shares) 3,046 3,643 3,951
Weighted-Average Grant Date Fair Value      
Outstanding, beginning of period (in dollars per share) $ 45 $ 36 $ 29
Vested (in dollars per share) 40
Canceled or expired (in dollars per share) 62
Outstanding, end of period (in dollars per share) $ 68 $ 45 $ 36
Weighted-Average Remaining Vesting Period      
Outstanding. end of period (in years) 1 year 2 months 12 days    
Aggregate Fair Value      
Vested $ 133,977 $ 168,816 $ 76,389
Outstanding, March 31, 2022 $ 233,797    
Time-based RSUs      
Number of Shares      
Granted (in shares) 868 1,046 1,431
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share) $ 103 $ 60 $ 38
Market-based and performance-based RSUs      
Number of Shares      
Granted (in shares) 203 303 365
Outstanding, end of period (in shares) 800    
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share) $ 124 $ 67 $ 40