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Property, Plant, and Equipment (Narrative) (Details) - USD ($) $ in Thousands					3 Months Ended			12 Months Ended
		Sep. 25, 2020	Aug. 11, 2020	Dec. 30, 2019	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Property Plant And Equipment [Line Items]
Pre-tax gain on sale of assets	[1]							$ 23,598	$ (1,925)	$ 1,106
Impairment of assets held for sale							$ 12,601	37,902
Duarte Facility [Member]
Property Plant And Equipment [Line Items]
Pre-tax gain on sale of assets			$ 8,801	$ 13,522	$ 8,801	$ 13,522		(22,323)
Disposal Groups [Member]
Property Plant And Equipment [Line Items]
Impairment of assets held for sale								37,902
Disposal Groups [Member] | Plant, Property and Equipment [Member]
Property Plant And Equipment [Line Items]
Impairment of assets held for sale								$ 13,421
Loveland Facility [Member]
Property Plant And Equipment [Line Items]
Pre-tax gain on sale 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 of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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