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Income Taxes - Foreign and Domestic Income Components (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]      
Domestic $ 2,320 $ (31,989) $ (9,609)
Foreign 13,742 (38,106) 13,783
Income (loss) from continuing operations before income taxes $ 16,062 $ (70,095) $ 4,174