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Stock-based Compensation Plans (Schedule of Share-based Compensation, Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs, Outstanding, Number 354,334 453,796 573,283 358,732
Outstanding, Weighted average grant date fair value per unit, end of period (in dollars per share) $ 20.85 $ 14.15 $ 12.88  
Granted, Weighted average grant date fair value per share 26.13 14.91 12.78  
RSUs, Vested in Period, Weighted Average Grant Date Fair Value 13.81 12.99 12.83  
Canceled, Weighted average grant date fair value per share 18.55 12.85 12.00  
Outstanding, Weighted average grant date fair value per unit, beginning of period (in dollars per share) $ 14.15 $ 12.88 $ 12.77  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 194,334 301,908 625,518  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (283,026) (367,315) (301,864)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 7.3 $ 4.7 $ 4.7  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (10,770) (54,080) (109,103)