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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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