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Property, Plant, and Equipment (Narrative) (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 25, 2020 | Aug. 11, 2020 | Dec. 30, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net gain (loss) on sales of assets |  |  |  | $ 4,452 | $ 23,598 | $ (1,925)
Impairment of assets held for sale |  |  |  |  | 37,902 |
Duarte Facility [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net gain (loss) on sales of assets |  | $ 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] |  |  |  |  |  |
Net gain (loss) on sales of assets | $ 2,330 |  |  |  |  |

X
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