OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Total comprehensive income (loss) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 53,429	$ 37,287	$ 125,678
Other comprehensive income (loss), net of taxes	(6,176)	(31,804)	26,369
Comprehensive income	$ 47,253	$ 5,483	$ 152,047