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Pensions and Other Post-retirement Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Components of Net Periodic Benefit Cost        
Interest cost $ 975 $ 1,115 $ 1,950 $ 2,231
Expected return on plan assets (1,299) (1,490) (2,598) (2,980)
Recognized net actuarial loss 575 493 1,150 986
Settlement   1,454   1,454
Net pension expense $ 251 $ 1,572 $ 502 $ 1,691