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Income Taxes - Components of Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]      
Domestic $ (42,573) $ (582,333) $ (194,639)
Foreign 94,106 (30,127) (7,852)
Total $ 51,533 $ (612,460) $ (202,491)