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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Retirement Benefits [Abstract]
Settlement expense	$ 1,814,000	$ 1,548,000	$ 1,814,000	$ 1,548,000
Employer contribution			$ 0

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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