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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 |

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