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Employee Benefit Plans - Schedule of Measurement of Partnership's Pension Plan Assets by Category (Details) - Pension Benefits [Member] - USD ($) $ in Thousands | Sep. 26, 2015 | Sep. 27, 2014 | Sep. 28, 2013
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Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | $ 104,303 | $ 117,771 | $ 120,776
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 104,303 | 117,771 |
Fair Value, Inputs, Level 2 [Member] | Short-term investments [Member] |  |  |  |
Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets | [1] | 99 | 1,500 |
Fair Value, Inputs, Level 2 [Member] | Domestic equity securities [Member] |  |  |  |
Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets | [1],[2] | 5,264 | 6,370 |
Fair Value, Inputs, Level 2 [Member] | International equity securities [Member] |  |  |  |
Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets | [1],[2] | 8,923 | 10,916 |
Fair Value, Inputs, Level 2 [Member] | Fixed income securities [Member] |  |  |  |
Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets | [1],[3] | $ 90,017 | $ 98,985 |
[1] | Includes funds which are not publicly traded and are valued at the net asset value of the units provided by the fund issuer.
[2] | Includes funds which invest primarily in a diversified portfolio of publicly traded U.S. and Non-U.S. common stock.
[3] | Includes funds which invest primarily in publicly traded and non-publicly traded, investment grade corporate bonds, U.S. government bonds and asset-backed securities.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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