EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Retirement Benefits [Abstract]
Interest cost	$ 745	$ 1,151	$ 1,489	$ 2,302
Expected return on plan assets	(2,545)	(2,586)	(5,089)	(5,172)
Amortization:
Prior service cost	0	4	0	8
Recognized actuarial loss	1,573	1,042	3,146	2,084
Net periodic expense (income)	$ (227)	$ (389)	$ (454)	$ (778)