Pension Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Components of net periodic pension cost (benefit)
Service cost	$ 165	$ 149
Interest cost	1,531	1,910
Expected return on plan assets	(2,946)	(3,009)
Amortization of actuarial loss	1,001	528
Administrative expenses	86	97
Net pension cost (benefit)	$ (163)	$ (325)