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Employee Benefit Plans (Fair Value Assumptions) (Details) - $ / shares
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
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 1.73% 1.67% 2.50%
Risk-free interest rate 2.35% 1.37% 0.51%
Expected volatility 31.00% 27.00% 35.00%
Expected life (years) 15 days 15 days 15 days
Weighted average fair value (in dollars per share) $ 9.33 $ 8.69 $ 5.73
Market Based RSUs      
Employee Benefit Plan      
Dividend yield 1.59% 1.75% 3.29%
Risk-free interest rate 2.51% 1.40% 0.86%
Expected volatility 30.00% 31.00% 34.00%
Expected life (years) 3 years 3 years 3 years