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Financial Instruments and Risk Management - Additional Information (Details) - USD ($) | 9 Months Ended | 12 Months Ended
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Jun. 26, 2021 | Sep. 26, 2020
Derivatives, Fair Value [Line Items] |  |
Maximum maturity period of highly liquid investment considered as cash equivalents | 3 months |
Interest Rate Risk [Abstract] |  |
Cash collateral | $ 0 | $ 4,718,000
Commodity Contract [Member] |  |
Interest Rate Risk [Abstract] |  |
Weighted average maturity of outstanding commodity-related derivatives | 5 months | 6 months
Federal Funds Rate [Member] |  |
Interest Rate Risk [Abstract] |  |
Description of applicable interest rate on borrowings | Federal Funds Rate |
Basis spread (in hundredths) | 0.50% |
LIBOR [Member] |  |
Interest Rate Risk [Abstract] |  |
Description of applicable interest rate on borrowings | LIBOR |
Basis spread (in hundredths) | 1.00% |

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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41678-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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