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Employee Stock-Based Compensation (Fair Value Assumptions) (Details) - $ / shares	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Employee Stock Purchase Plans
Employee Benefit Plan
Expected dividend rate	1.35%	1.61%	1.78%
Risk-free interest rate	4.71%	5.36%	3.86%
Expected volatility	29.00%	33.00%	46.00%
Expected term (years)	6 months	6 months	6 months
Weighted average grant date fair value per share (in dollars per share)	$ 21.74	$ 19.02	$ 16.32
PSUs
Employee Benefit Plan
Expected dividend rate	1.41%	1.90%	1.46%
Risk-free interest rate	4.55%	3.83%	2.78%
Expected volatility	38.00%	41.00%	39.00%
Expected term (years)	3 years	3 years	3 years
Weighted average grant date fair value per share (in dollars per share)	$ 91	$ 67	$ 69

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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