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.