EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Retirement Benefits [Abstract]
Interest cost	$ 1,148	$ 1,570	$ 3,450	$ 4,711
Expected return on plan assets	(2,585)	(2,583)	(7,757)	(7,749)
Amortization:
Prior service cost	3	4	11	11
Recognized actuarial loss	1,042	222	3,126	666
Net periodic expense (income)	$ (392)	$ (787)	$ (1,170)	$ (2,361)