Pensions and Other Post-retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Components of Net Periodic Benefit Cost
Interest cost	$ 975	$ 1,116
Expected return on plan assets	(1,299)	(1,490)
Recognized net actuarial loss	575	493
Net pension expense	$ 251	$ 119