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RETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
RETIREMENT PLANS
Interest cost	$ 824	$ 875	$ 1,648	$ 1,750
Expected return on assets	(1,041)	(1,086)	(2,082)	(2,172)
Actuarial loss	(543)	(487)	(1,087)	(974)
Net periodic benefit cost	$ 326	$ 276	$ 653	$ 552

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