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Postretirement Benefits - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 382 $ 268 $ 546
Interest cost 75 22 66
Amortization of losses 5 7 1
Expected return on assets (66) (130) (156)
Net periodic pension cost 396 167 457
Curtailment gain     (227)
Settlement (gain) loss   (259)  
Total pension cost (gain) $ 396 $ (92) $ 230