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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs, Outstanding, Number 573,283 358,732 396,097 408,506
Outstanding, Weighted average grant date fair value per share $ 12.88 $ 12.77 $ 11.78 $ 11.41
Outstanding, Weighted average remaining contractual term 10 months 24 days 8 months 12 days 9 months 18 days 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 625,518 223,379 220,795  
Granted, Weighted average grant date fair value per share $ 12.78 $ 13.41 $ 12.29  
Settlement of performance-based restricted stock units, net of shares withheld for taxes 301,864 251,981 228,121  
RSUs, Vested in Period, Weighted Average Grant Date Fair Value $ 12.83 $ 11.81 $ 11.62  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 7.3 $ 2.8 $ 2.8  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (109,103) (8,763) (5,083)  
Canceled, Weighted average grant date fair value per share $ 12.00 $ 11.87 $ 11.41