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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Pension Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Interest cost	$ 2,925	$ 3,598	$ 4,389
Expected return on plan assets	(3,722)	(4,784)	(5,523)
Recognized net actuarial loss	3,205	2,718	1,229
Settlement	3,448	3,001	1,953
Other	(81)	0	0
Net pension expense	$ 5,775	$ 4,533	$ 2,048

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