Pension Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Components of net periodic pension cost (benefit)
Service cost	$ 151	$ 158
Interest cost	1,759	2,261
Expected return on plan assets	(3,199)	(3,472)
Amortization of actuarial loss	910	413
Administrative expenses	47	41
Net pension benefit	$ (332)	$ (599)