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Stock Compensation Plans: Fair Value Assumptions (Details) - Stock Options	12 Months Ended
	Sep. 30, 2023 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility (as a percent)	33.00%
Expected life (in years)	5 years
Expected dividend yield (as a percent)	2.99%
Risk free interest rate (as a percent)	3.58%
Grant date fair value per share (in dollars per share)	$ 8.65

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.

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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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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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Price of a single share of a number of saleable stocks of a company.

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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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