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Stock Compensation Plans - Weighted Average Assumptions for Options Granted (Details) - Stock Options
9 Months Ended
Jun. 30, 2024
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected volatility (percent) 33.00%
Expected term (in years) 5 years
Expected dividend yield (percent) 2.99%
Risk free interest rate (percent) 3.58%
Grant date fair value per share (dollars per share) $ 8.65