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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
Mar. 27, 2021
Sep. 26, 2020
Asset Derivatives [Abstracts]    
Gross amounts $ 19,725 $ 6,836
Effects of netting (8,191) (5,309)
Net amounts presented in the balance sheet 11,534 1,527
Liability Derivatives [Abstracts]    
Gross amounts 12,631 7,993
Effects of netting (8,191) (5,309)
Net amounts presented in the balance sheet $ 4,440 $ 2,684