v3.26.1
Financial Instruments and Risk Management - Effect of the Partnership's Derivative Instruments on the Condensed Consolidated Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Derivative Instruments Gain Loss [Line Items]        
Cost of Product and Service Sold [1] $ 101,051 $ 99,559 $ 439,390 $ 489,083
Commodity-Related Derivatives [Member] | Derivatives Not Designated as Hedging Instruments [Member]        
Derivative Instruments Gain Loss [Line Items]        
Unrealized Gains (Losses) Recognized in Income $ 704 $ (2,919) $ 276 $ 1,459
Commodity-Related Derivatives [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold        
Derivative Instruments Gain Loss [Line Items]        
Cost, Product and Service [Extensible Enumeration] Cost of Product and Service Sold Cost of Product and Service Sold Cost of Product and Service Sold Cost of Product and Service Sold
[1] The cost of products sold reported in the condensed consolidated statements of operations represents the weighted average unit cost of propane, fuel oil and refined fuels, and natural gas and electricity sold, including transportation costs to deliver products from the Partnership’s supply points to storage locations or to the Partnership’s customer service centers. Cost of products sold also includes the cost of appliances and related parts sold or installed computed on a basis that approximates the average cost of the products. Cost of products sold does not include depreciation and amortization expense.