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Stock-based Compensation Plans (Schedule of Share-based Compensation, Phantom Award Activity) (Details) - Phantom Share Units (PSUs) [Member] - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, shares 415,380 356,667 339,131
Outstanding, Weighted average grant date fair value per unit, beginning of period (in dollars per share) $ 12.71 $ 12.09 $ 12.74
Granted, Weighted average grant date fair value per share 25.61 13.28 11.53
Canceled, Weighted average grant date fair value per share 16.01 12.53 12.22
Outstanding, Weighted average grant date fair value per unit, end of period (in dollars per share) $ 18.03 $ 12.71 $ 12.09
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 143,589 236,250 294,063
Vested, shares (195,118) (156,585) (156,012)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 2.5 $ 1.5 $ 0.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (39,482) (20,952) (120,515)
Outstanding, shares 324,369 415,380 356,667