EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Retirement Benefits [Abstract]
Interest cost	$ 1,151	$ 1,571	$ 2,302	$ 3,141
Expected return on plan assets	(2,586)	(2,583)	(5,172)	(5,166)
Amortization:
Prior service cost	4	3	8	7
Recognized actuarial loss	1,042	222	2,084	444
Net periodic expense (income)	$ (389)	$ (787)	$ (778)	$ (1,574)