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Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense for intangible assets $ 31.5 $ 32.5 $ 35.5