Capital Stock (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Aug. 31, 2024	Sep. 30, 2024	Sep. 30, 2025
Capital Stock
Common shares as presented in the accompanying Consolidated Balance Sheets		30,809,483	30,886,024
Common shares in treasury		5,056,771	5,056,771
Board of Directors authorized an expanded stock repurchase program			$ 200
Share Repurchase Program, Period in Force	3 years
Stock repurchases during period, shares		80,500

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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Period share may be purchased under authorized share repurchase plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

No definition available.

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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.

+ References

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-Name Accounting Standards Codification
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-Topic 946
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-Topic 946
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- Definition

Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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