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Property and Equipment - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Property, Plant and Equipment [Abstract]      
Construction in progress, gross $ 15,000 $ 7,700  
Depreciation expense 12,900 11,600 $ 10,300
Impairment loss of property and equipment $ 10,600 $ 58 $ 1,000