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Financial Instruments and Risk Management - Fair Value of the Partnership's Derivative Instruments and their Location in the Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 27, 2025 | Sep. 28, 2024
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Fair value - assets | $ 4,213 | $ 13,649
Fair value - liabilities | 4,543 | 14,502
Commodity-Related Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - assets | 4,213 | 13,649
Fair value - liabilities | 4,543 | 14,502
Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - assets | 1,606 | 4,891
Fair value - liabilities | 1,936 | 5,744
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - assets | 1,504 | 4,122
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - assets | 102 | 769
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - liabilities | 1,883 | 5,744
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - liabilities | $ 53 | $ 0

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