Pensions and Other Post-retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Components of Net Periodic Benefit Cost
Interest cost	$ 975	$ 1,116	$ 2,925	$ 3,347
Expected return on plan assets	(1,298)	(1,490)	(3,896)	(4,470)
Recognized net actuarial loss	574	493	1,724	1,479
Settlement	1,411	1,889	1,411	3,343
Net pension expense	$ 1,662	$ 2,008	$ 2,164	$ 3,699