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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 | Jun. 24, 2017 | Sep. 24, 2016
--- | --- | ---
Asset Derivatives [Abstracts] |  |
Gross amounts | $ 6,709 | $ 7,072
Effects of netting | (4,764) | (2,220)
Net amounts presented in the balance sheet | 1,945 | 4,852
Liability Derivatives [Abstracts] |  |
Gross amounts | 7,570 | 4,780
Effects of netting | (4,764) | (2,220)
Net amounts presented in the balance sheet | 2,806 | 2,560
Commodity-Related Derivatives [Member] |  |
Asset Derivatives [Abstracts] |  |
Gross amounts | 6,709 | 6,842
Effects of netting | (4,764) | (1,990)
Net amounts presented in the balance sheet | 1,945 | 4,852
Liability Derivatives [Abstracts] |  |
Gross amounts | 7,570 | 4,345
Effects of netting | (4,764) | (1,990)
Net amounts presented in the balance sheet | 2,806 | 2,355
Interest Rate Swaps [Member] |  |
Asset Derivatives [Abstracts] |  |
Gross amounts | 0 | 230
Effects of netting | 0 | (230)
Net amounts presented in the balance sheet | 0 | 0
Liability Derivatives [Abstracts] |  |
Gross amounts | 0 | 435
Effects of netting | 0 | (230)
Net amounts presented in the balance sheet | $ 0 | $ 205

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