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Income Taxes - Components of Loss Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]      
Domestic $ (582,333) $ (194,639) $ (170,570)
Foreign (30,127) (7,852) (1,708)
Total $ (612,460) $ (202,491) $ (172,278)