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INCOME TAXES - Domestic and Foreign Income (Loss) before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]      
Domestic $ 584,891 $ (14,411) $ (412,556)
Foreign 8,488 45,730 (17,315)
Income (loss) before income taxes $ 593,379 $ 31,319 $ (429,871)