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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. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
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Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | $ 101,077 | $ 104,303 | $ 117,771
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 101,077 | 104,303 |
Fair Value, Inputs, Level 2 [Member] | Short-term investments [Member] |  |  |  |
Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets | [1] | 1,456 | 99 |
Fair Value, Inputs, Level 2 [Member] | Domestic equity securities [Member] |  |  |  |
Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets | [1],[2] | 5,397 | 5,264 |
Fair Value, Inputs, Level 2 [Member] | International equity securities [Member] |  |  |  |
Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets | [1],[2] | 9,501 | 8,923 |
Fair Value, Inputs, Level 2 [Member] | Fixed income securities [Member] |  |  |  |
Fair value of plan assets [Abstract] |  |  |  |
Fair value of plan assets | [1],[3] | $ 84,723 | $ 90,017 |
[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 Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=64937038&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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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