OTHER COMPREHENSIVE INCOME (LOSS) - Total comprehensive income (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income (loss)	$ (191,558)	$ 79,211	$ 53,429
Other comprehensive income (loss), net of taxes	(36,761)	26,115	(6,176)
Comprehensive income (loss)	$ (228,319)	$ 105,326	$ 47,253