Financial Instruments and Risk Management - Fair Value of the Partnership's Derivative Instruments and their Location in the Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 28, 2025	Sep. 28, 2024
Commodity-Related Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	$ 7,741	$ 13,649
Fair value - liabilities	8,210	14,502
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	3,327	4,891
Fair value - liabilities	3,796	5,744
Derivatives Not Designated as Hedging Instruments [Member] \| Commodity-Related Derivatives [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	3,137	4,122
Derivatives Not Designated as Hedging Instruments [Member] \| Commodity-Related Derivatives [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	190	769
Derivatives Not Designated as Hedging Instruments [Member] \| Commodity-Related Derivatives [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value - liabilities	3,796	5,744
Derivatives Not Designated as Hedging Instruments [Member] \| Commodity-Related Derivatives [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value - liabilities	$ 0	$ 0

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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