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Other (Income) Expense, Net (Schedule of Other (Income) Expense, Net) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Other (Income) Expense, Net [Abstract] |  |  |  |
Equity interest in the earnings of the JV (Note 6) | $ (3,290) | $ (738) | $ (7,761) | $ (2,340)
Net loss (gain) on sales of assets | 680 | 50 | 880 | (404)
Rent income | (44) | (28) | (188) | (99)
Net gain on investments in deferred compensation program | (894) | (257) | (821) | (957)
Loss on forward option derivative instrument (Note 8) |  | 5,543 |  | 5,543
Other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense | (3,245) | (3,222) | (9,739) | (9,603)
Other | (123) | (373) | (505) | (731)
Other expense (income), net | $ (6,916) | $ 975 | $ (18,134) | $ (8,591)

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