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Employee Benefit Plans (Unamortized Share-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Employee Benefit Plan      
Unamortized Expense $ 90,536    
ESPP      
Employee Benefit Plan      
Unamortized Expense $ 1,442    
Remaining Months 4 months    
Stock Options      
Employee Benefit Plan      
Unamortized Expense $ 4,369    
Remaining Months 24 months    
Time-based RSUs      
Employee Benefit Plan      
Unamortized Expense $ 71,545    
Remaining Months 26 months    
Market-based and performance-based RSUs      
Employee Benefit Plan      
Unamortized Expense $ 13,180    
Remaining Months 21 months    
Restricted Stock Units (RSUs)      
Employee Benefit Plan      
Tax benefit realized for the tax deduction from RSUs vested during period $ 12,100 $ 16,200 $ 20,300