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Other (Income) Expense, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other (Income) Expense, Net        
Equity interest in losses (earnings) of the JV (Note 4) $ (738) $ 432 $ (2,340) $ (634)
Net (gain) loss on sales of assets 50 64 (404) (3,598)
Rent income (28) (53) (99) (196)
Net (gain) loss on investments in deferred compensation program (257) (523) (957) (1,252)
Loss on forward options derivative instrument (Note 7) 5,543   5,543  
Other (373) (370) (731) (673)
Other (income) expense, net $ 4,197 $ (450) $ 1,012 $ (6,353)