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Income Taxes - Components of Loss Before Income Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]      
Domestic $ (100,356) $ (213,764) $ (158,876)
Foreign 87 (74,056) (1,298)
Loss before income taxes $ (100,269) $ (287,820) $ (160,174)