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Other Expense (Income), Net (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other Expense (Income), Net [Abstract]    
Equity interest in the earnings of the JV (Note 6) $ (1,465) $ (596)
Net (gain) loss on sales of assets 79 (58)
Rent income (67) (54)
Net (gain) loss on investments in deferred compensation program 1,729 (654)
Other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense (3,243) (3,148)
Other (212) (210)
Other expense (income), net $ (3,179) $ (4,720)