RETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
RETIREMENT PLANS
Interest cost	$ 875	$ 821	$ 2,626	$ 2,461
Expected return on plan assets	(1,086)	(975)	(3,259)	(2,924)
Actuarial loss	(487)	(548)	(1,461)	(1,644)
Net periodic benefit cost	$ 276	$ 394	$ 828	$ 1,181