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Leases - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Leases [Abstract]      
Weighted average remaining lease term (years) 19 years    
Operating lease expense $ 34.3 $ 33.8 $ 30.4
Variable lease expense $ 1.0 $ 0.7 $ 0.7
Operating lease renewal term 25 years    
Weighted average discount rate 6.60%