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Pensions and Other Post-retirement Benefits (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 Benefit Cost        
Interest cost $ 1,116 $ 1,171 $ 3,347 $ 3,513
Expected return on plan assets (1,490) (1,743) (4,470) (5,229)
Recognized net actuarial loss 493 309 1,479 927
Settlement 1,889 1,200 3,343 1,200
Net pension expense $ 2,008 $ 937 $ 3,699 $ 411