Pension Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Components of net periodic pension cost (benefit)
Service cost	$ 147	$ 166	$ 457	$ 505
Interest cost	2,247	2,248	6,787	6,833
Expected return on plan assets	(3,253)	(3,483)	(10,028)	(10,363)
Amortization of actuarial loss	489	183	1,401	521
Administrative expenses	45	42	131	121
Net pension benefit	$ (325)	$ (844)	$ (1,252)	$ (2,383)