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Financial Instruments and Risk Management - Additional Information (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 29, 2019 | Sep. 29, 2018
Derivatives Fair Value [Line Items] |  |
Maximum maturity period of highly liquid investment considered as cash equivalents | 3 months |
Margin over basis rate (in hundredths) | 1.00% |
Cash collateral | $ 3,891 | $ 0
Commodity Contract [Member] |  |
Derivatives Fair Value [Line Items] |  |
Weighted average maturity of outstanding commodity-related derivatives | 5 months | 4 months

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