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Intangible Assets - Actual and Estimated Amortization Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 14.5 $ 16.7 $ 16.8
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity      
2026 12.5    
2027 12.0    
2028 11.9    
2029 11.9    
2030 $ 10.7