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Share-Based Compensation (Stock Option Valuation Assumptions) (Details) - Stock Options - USD ($)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividends	$ 0	$ 0	$ 0
Risk-free rate	4.50%
Weighted-average grant date fair value of options granted (in USD per share)	$ 27.97	$ 23.79	$ 20.10
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	30.40%	30.20%	30.80%
Expected term in years	6 years	6 years	6 years
Risk-free rate		3.60%	2.80%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	30.80%	31.60%	30.90%
Expected term in years	7 years	7 years	7 years
Risk-free rate		4.10%	2.90%

X

- 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).

+ References

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-Section 50
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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

Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual term.

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- Definition

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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