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Employee Benefit Plans (Fair Value Assumptions) (Details) - $ / shares	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
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	1.74%	1.73%	1.67%
Risk-free interest rate	1.81%	2.35%	1.37%
Expected volatility	24.00%	31.00%	27.00%
Expected life (years)	15 days	15 days	15 days
Weighted average fair value (in dollars per share)	$ 9.35	$ 9.33	$ 8.69
Market Based RSUs
Employee Benefit Plan
Dividend yield	1.76%	1.59%	1.75%
Risk-free interest rate	2.11%	2.51%	1.40%
Expected volatility	30.00%	30.00%	31.00%
Expected life (years)	3 years	3 years	3 years

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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