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Other (Income) Expense, Net (Schedule of Other (Income) Expense, Net) (Parenthetical) (Details) - USD ($) $ in Thousands				3 Months Ended		12 Months Ended
		Aug. 11, 2020	Dec. 30, 2019	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Net (gain) loss on sales of assets	[1]					$ 23,598	$ (1,925)	$ 1,106
Net loss on divestiture						515
Duarte Facility [Member]
Net (gain) loss on sales of assets		$ 8,801	$ 13,522	$ 8,801	$ 13,522	(22,323)
Loveland Campus [Member]
Net (gain) loss on sales of assets						$ (2,330)
[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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Amount after tax of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a discontinued operation.

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