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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. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
--- | --- | --- | ---
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets |  | $ 85,649 | $ 101,077 | $ 104,303
Short-term investments [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1,498 | 1,456 |
Domestic equity securities [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1],[2] | 4,701 | 5,397 |
International equity securities [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1],[2] | 8,006 | 9,501 |
Fixed income securities [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1],[3] | $ 71,444 | $ 84,723 |
[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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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