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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. 25, 2021 | Sep. 26, 2020
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Derivatives, Fair Value [Line Items] |  |
Fair value - assets | $ 76,508 | $ 6,836
Fair value - liabilities | 32,023 | 7,993
Commodity-Related Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - assets | 76,508 | 6,836
Fair value - liabilities | 32,023 | 7,993
Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - assets | 54,832 | 1,527
Fair value - liabilities | 10,347 | 2,684
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - assets | 53,019 | 1,066
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - assets | 1,813 | 461
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - liabilities | 8,715 | 2,684
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value - liabilities | $ 1,632 | $ 0

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