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Leases - Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Leases [Abstract]      
Operating Lease, Payments $ 7.5 $ 7.0  
Finance Lease, Principal Payments $ 1.3 $ 0.9 $ 1.1