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Defined Benefit Pension Plan - Net Periodic Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Retirement Benefits [Abstract]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 158 148 493 436
Expected return on plan assets (242) (213) (750) (623)
Settlement cost 0 0 (8) 0
Total net periodic (benefit) $ (84) $ (65) $ (265) $ (187)