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. 27, 2026	Sep. 27, 2025
Derivatives, Fair Value [Line Items]
Other Assets, Current	$ 38,285	$ 22,664
Other Assets, Noncurrent	85,752	77,124
Other Liabilities, Current	41,458	54,646
Other Liabilities, Noncurrent	47,497	53,229
Commodity-Related Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	3,341	4,213
Fair value - liabilities	3,926	4,543
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	675	1,606
Fair value - liabilities	1,260	1,936
Derivatives Not Designated as Hedging Instruments [Member] \| Commodity-Related Derivatives [Member] \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent
Derivatives, Fair Value [Line Items]
Fair value - assets	675	1,504
Derivatives Not Designated as Hedging Instruments [Member] \| Commodity-Related Derivatives [Member] \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent
Derivatives, Fair Value [Line Items]
Fair value - assets	0	102
Derivatives Not Designated as Hedging Instruments [Member] \| Commodity-Related Derivatives [Member] \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent
Derivatives, Fair Value [Line Items]
Fair value - liabilities	1,260	1,883
Derivatives Not Designated as Hedging Instruments [Member] \| Commodity-Related Derivatives [Member] \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivatives, Fair Value [Line Items]
Fair value - liabilities	$ 0	$ 53

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