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Other (Income) Expense, Net (Schedule of Other (Income) Expense, Net) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Other (Income) Expense, Net [Abstract]        
Equity interest in the earnings of the JV (Note 6) $ (3,006) $ (1,006) $ (4,471) $ (1,602)
Net (gain) loss on sales of assets 121 (396) 200 (454)
Rent income (77) (17) (144) (71)
Net (gain) loss on investments in deferred compensation program (1,656) (46) 73 (700)
Other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense (3,251) (3,233) (6,494) (6,381)
Other (170) (148) (382) (358)
Other expense (income), net $ (8,039) $ (4,846) $ (11,218) $ (9,566)