INCOME TAXES - Components of Income before taxes and discontinued operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Domestic	$ (247,004)	$ 55,835	$ 27,306
Non-U.S.	(23,875)	54,120	40,175
Income (loss) before taxes from continuing operations	$ (270,879)	$ 109,955	$ 67,481