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Financial Instruments and Risk Management - Fair Value of Partnership's Recognized Derivative Assets and Liabilities on a Gross Basis and Amounts Offset on Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Sep. 28, 2019
--- | --- | ---
Asset Derivatives [Abstracts] |  |
Gross amounts | $ 6,836 | $ 10,464
Effects of netting | (5,309) | (6,215)
Net amounts presented in the balance sheet | 1,527 | 4,249
Liability Derivatives [Abstracts] |  |
Gross amounts | 7,993 | 9,575
Effects of netting | (5,309) | (6,215)
Net amounts presented in the balance sheet | 2,684 | 3,360
Commodity-Related Derivatives [Member] |  |
Asset Derivatives [Abstracts] |  |
Gross amounts | 6,836 | 10,464
Effects of netting | (5,309) | (6,215)
Net amounts presented in the balance sheet | 1,527 | 4,249
Liability Derivatives [Abstracts] |  |
Gross amounts | 7,993 | 9,575
Effects of netting | (5,309) | (6,215)
Net amounts presented in the balance sheet | $ 2,684 | $ 3,360

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