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Estimated Fair Value of Options on Dates of Each Grant Using Binomial Option Pricing Model (Detail) - Employees Stock Option	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.67%	0.51%	0.43%
Expected volatility	21.91%	21.97%	21.71%
Risk-free interest rate, lower range	7.21%	6.14%	4.99%
Expected term (in years)	4 years 6 months	2 years 6 months 10 days	2 years 7 months 2 days
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.71%	0.97%	0.46%
Expected volatility	27.42%	33.50%	31.79%
Risk-free interest rate, upper range	7.55%	7.59%	6.43%
Expected term (in years)	7 years 3 months	7 years 3 months	5 years 4 months 9 days

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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-Topic 718
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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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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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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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