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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
Dec. 29, 2018
Sep. 29, 2018
Asset Derivatives [Abstracts]    
Gross amounts $ 7,386 $ 23,181
Effects of netting (1,387) (8,293)
Net amounts presented in the balance sheet 5,999 14,888
Liability Derivatives [Abstracts]    
Gross amounts 13,504 14,582
Effects of netting (1,387) (8,293)
Net amounts presented in the balance sheet $ 12,117 $ 6,289