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Stock-Based Compensation - Valuation Assumptions (Details)	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	4.21%	4.04%
Expected volatility of the Company’s stock	27.20%	33.50%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	3.86%	3.59%
Expected volatility of the Company’s stock	29.80%	29.40%
Expected life of option (years)	5 years 8 months 12 days	5 years 9 months 18 days
Expected dividend yield on the Company’s stock	2.77%	2.10%

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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- 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 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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