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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, 2020 | Sep. 28, 2019 | Sep. 29, 2018
--- | --- | --- | ---
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets |  | $ 80,001 | $ 80,913 | $ 78,032
Short-term investments [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1,485 | 1,502 |
Domestic equity securities [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1],[2] | 4,138 | 4,314 |
International equity securities [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1],[2] | 7,117 | 7,393 |
Fixed income securities [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [1],[3] | $ 67,261 | $ 67,704 |
[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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