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INCOME TAXES - Domestic and Foreign Income (Loss) before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]      
Domestic $ (412,556) $ (458,364) $ (45,118)
Foreign (28,624) (178,134) (6,104)
Loss from continuing operations before income taxes $ (441,180) $ (636,498) $ (51,222)