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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
Sep. 30, 2017
Sep. 24, 2016
Asset Derivatives [Abstracts]    
Gross amounts $ 16,378 $ 7,072
Effects of netting (4,443) (2,220)
Net amounts presented in the balance sheet 11,935 4,852
Liability Derivatives [Abstracts]    
Gross amounts 6,853 4,780
Effects of netting (4,443) (2,220)
Net amounts presented in the balance sheet 2,410 2,560
Commodity-Related Derivatives [Member]    
Asset Derivatives [Abstracts]    
Gross amounts 16,378 6,842
Effects of netting (4,443) (1,990)
Net amounts presented in the balance sheet 11,935 4,852
Liability Derivatives [Abstracts]    
Gross amounts 6,853 4,345
Effects of netting (4,443) (1,990)
Net amounts presented in the balance sheet $ 2,410 2,355
Interest Rate Swaps [Member]    
Asset Derivatives [Abstracts]    
Gross amounts   230
Effects of netting   (230)
Net amounts presented in the balance sheet   0
Liability Derivatives [Abstracts]    
Gross amounts   435
Effects of netting   (230)
Net amounts presented in the balance sheet   $ 205