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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Pension Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Retirement Benefits [Abstract]
Interest cost	$ 4,389	$ 4,077	$ 4,053
Expected return on plan assets	(5,523)	(5,555)	(5,130)
Recognized net actuarial loss	1,229	1,926	2,891
Settlement	1,953	913	1,640
Net pension expense	$ 2,048	$ 1,361	$ 3,454

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