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Stock-based Compensation Plans (Schedule of Share-based Compensation. Option Activity (Details) - 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]        
Exercised, shares (110,989) (36,731) (151,399)  
Stock Options, Exercisable, Number 409,391      
2006 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, shares 1,013,293 599,799 328,099  
Outstanding, Weighted average exercise price (per share) $ 12.10 $ 12.19 $ 10.67 $ 6.11
Outstanding, Weighted average remaining contractual term, years 7 years 9 months 18 days 7 years 8 months 12 days 7 years 9 months 18 days 2 years 3 months 18 days
Outstanding, Aggregate intrinsic value $ 1.0 $ 0.3 $ 2.7 $ 1.4
Exercised, shares (131,989) (36,731) (151,399)  
Exercised, Weighted average exercise price (per share) $ 9.59 $ 5.67 $ 4.09  
Exercised, Aggregate intrinsic value $ 0.4 $ 0.2 $ 1.7  
Canceled, shares (327,115) (7,257) (8,421)  
Canceled, Weighted average exercise price (per share) $ 0 $ 0 $ 0  
Stock Options, Exercisable, Number 412,095      
Exercisable, Weighted average exercise price (per share) $ 11.97      
Exercisable, Weighted average remaining contractual term, years 6 years 6 months      
Exercisable, Aggregate intrinsic value $ 0.4      
Outstanding, shares 1,127,468 1,013,293 599,799 328,099
Granted, Weighted average exercise price (per share) $ 11.41 $ 13.64 $ 11.86  
Granted, shares 573,279 457,482 431,520