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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Pension Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Retirement Benefits [Abstract]
Interest cost	$ 3,598	$ 4,389	$ 4,077
Expected return on plan assets	(4,784)	(5,523)	(5,555)
Recognized net actuarial loss	2,718	1,229	1,926
Settlement	3,001	1,953	913
Net pension expense	$ 4,533	$ 2,048	$ 1,361

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