Pension Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Components of net periodic pension cost (benefit)
Service cost	$ 150	$ 153	$ 449	$ 459
Interest cost	1,915	1,891	5,746	5,672
Expected return on plan assets	(3,020)	(3,549)	(9,063)	(10,644)
Amortization of actuarial loss	530	700	1,592	2,098
Administrative expenses	97	108	291	328
Net pension cost (benefit)	$ (328)	$ (697)	$ (985)	$ (2,087)