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Capital Stock (Details) - USD ($) $ in Millions	12 Months Ended
Capital Stock (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Capital Stock
Common shares as presented in the accompanying Consolidated Balance Sheets	30,781,699	30,707,748
Common shares in treasury	4,995,414	4,854,997
Board of Directors authorized an expanded stock repurchase program	$ 200.0
Stock repurchases during period, shares	140,000	257,500	0
Stock repurchased during period, value	$ 12.4	$ 20.0

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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