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Other (Income) Expense, Net (Schedule of Other (Income) Expense, Net) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Nonoperating Income Expense [Abstract] |  |  |  |
Equity interest in the earnings of the JV (Note 7) |  | $ (15,580) | $ (12,932) | $ (3,339)
Net (gain) loss on sales of assets and businesses | [1] | (23,598) | 1,925 | (1,106)
Rent income |  | (1,403) | (245) | (170)
Net (gain) loss on investments in deferred compensation program |  | (3,376) | (942) | (1,661)
Loss on forward option derivative instrument |  |  |  | 5,543
Other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense |  | (11,809) | (12,965) | (12,801)
Other |  | (400) | (810) | (792)
Other (income) expense, net |  | $ (56,166) | $ (25,969) | $ (14,326)
[1] | Included in net (gain) loss on sale of assets and businesses for the fiscal year ended September 30, 2020 was the pre-tax gain on sale of Duarte real property in the amount of $22,323, the pre-tax gain on sale of the Loveland campus of $2,330, and a net loss on divestiture of the disposal group of $515.

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