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Property and Equipment - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment [Abstract]      
Construction in progress, gross $ 1.5 $ 3.4  
Depreciation expense 10.3 8.0 $ 8.2
Impairment loss of property and equipment $ 1.0 $ 2.0 $ 0.3