OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Total Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 37,287	$ 125,678	$ 14,912
Other comprehensive income (loss), net of taxes	(31,804)	26,369	20,760
Comprehensive income	$ 5,483	$ 152,047	$ 35,672