EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Retirement Benefits [Abstract]
Interest cost	$ 745	$ 1,148	$ 2,234	$ 3,450
Expected return on plan assets	(2,544)	(2,585)	(7,633)	(7,757)
Amortization:
Prior service cost	0	3	0	11
Recognized actuarial loss	1,573	1,042	4,719	3,126
Net periodic expense (income)	$ (226)	$ (392)	$ (680)	$ (1,170)