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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. 29, 2019
Sep. 29, 2018
Asset Derivatives [Abstracts]    
Gross amounts $ 16,852 $ 23,181
Effects of netting (11,599) (8,293)
Net amounts presented in the balance sheet 5,253 14,888
Liability Derivatives [Abstracts]    
Gross amounts 15,414 14,582
Effects of netting (11,599) (8,293)
Net amounts presented in the balance sheet $ 3,815 $ 6,289