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Financial Instruments and Risk Management - Additional Information (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 28, 2020 | Sep. 28, 2019
Derivatives, Fair Value [Line Items] |  |
Maximum maturity period of highly liquid investment considered as cash equivalents | 3 months |
Interest Rate Risk [Abstract] |  |
Cash collateral | $ 4,713,000 | $ 5,392,000
Commodity Contract [Member] |  |
Interest Rate Risk [Abstract] |  |
Weighted average maturity of outstanding commodity-related derivatives | 8 months | 3 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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