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Employee Benefit Plans (Fair Value Assumptions) (Details) - $ / shares
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Employee Stock Option      
Employee Benefit Plan      
Dividend yield     1.72%
Risk-free interest rate     2.45%
Expected volatility     33.00%
Expected life (years)     6 years 2 months 12 days
Weighted average fair value (in dollars per share)     $ 11.55
Employee Stock Purchase Plans      
Employee Benefit Plan      
Dividend yield 1.04% 1.74% 1.73%
Risk-free interest rate 0.10% 1.81% 2.35%
Expected volatility 47.00% 24.00% 31.00%
Expected life (years) 6 months 6 months 6 months
Weighted average fair value (in dollars per share) $ 24.67 $ 9.35 $ 9.33
Market Based RSUs      
Employee Benefit Plan      
Dividend yield 1.24% 1.76% 1.59%
Risk-free interest rate 0.21% 2.11% 2.51%
Expected volatility 31.00% 30.00% 30.00%
Expected life (years) 3 years 3 years 3 years