Pension Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Components of net periodic pension cost (benefit)
Service cost	$ 149	$ 151
Interest cost	1,910	1,880
Expected return on plan assets	(3,009)	(3,525)
Amortization of actuarial loss	528	692
Administrative expenses	97	110
Net pension cost (benefit)	$ (325)	$ (692)