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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) - Commodity-Related Derivatives [Member] - USD ($)
$ in Thousands
Jun. 27, 2020
Sep. 28, 2019
Asset Derivatives [Abstracts]    
Gross amounts $ 13,684 $ 10,464
Effects of netting (12,469) (6,215)
Net amounts presented in the balance sheet 1,215 4,249
Liability Derivatives [Abstracts]    
Gross amounts 15,683 9,575
Effects of netting (12,469) (6,215)
Net amounts presented in the balance sheet $ 3,214 $ 3,360