Financial Instruments and Risk Management - Fair Value of the Partnership's Derivative Instruments and their Location in the Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 27, 2015	Sep. 27, 2014
Derivatives, Fair Value [Line Items]
Fair value - assets	$ 8,144	$ 11,672
Fair value - liabilities	5,055	10,806
Commodity-Related Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	7,030	9,533
Fair value - liabilities	2,589	7,127
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	1,114	2,139
Fair value - liabilities	2,466	3,679
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	5,311	3,986
Fair value - liabilities	870	1,580
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	5,042	3,924
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets	269	62
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value - liabilities	756	1,527
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value - liabilities	114	53
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair value - liabilities	1,352	1,540
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value - liabilities	1,101	1,257
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value - liabilities	$ 251	$ 283