Unit-Based Compensation Arrangements - Additional Information (Details) - USD ($) $ in Thousands			12 Months Ended
	May. 13, 2015	Aug. 06, 2013	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Unit Plans, terms of award			In accordance with an August 6, 2013 amendment to the Restricted Unit Plans, unless otherwise stipulated by the Compensation Committee of the Partnership’s Board of Supervisors on or before the grant date, all restricted unit awards granted after the date of the amendment will vest 33.33% on each of the first three anniversaries of the award grant date. Prior to the August 6, 2013 amendment, unless otherwise stipulated by the Compensation Committee of the Partnership’s Board of Supervisors on or before the grant date, restricted units issued under the Restricted Unit Plans vest over time with 25% of the Common Units vesting at the end of each of the third and fourth anniversaries of the grant date and the remaining 50% of the Common Units vesting at the end of the fifth anniversary of the grant date. The Restricted Unit Plans participants are not eligible to receive quarterly distributions on, or vote, their respective restricted units until vested. Restricted units cannot be sold or transferred prior to vesting. The value of the restricted unit is established by the market price of the Common Unit on the date of grant, net of estimated future distributions during the vesting period. Restricted units are subject to forfeiture in certain circumstances as defined in the Restricted Unit Plans.
Total number of Common Units authorized for issuance (in units)			3,102,122
Additional number of common units authorized for issuance (in units)	1,200,000
Unrecognized compensation cost			$ 5,211
Weighted-average recognition period of compensation cost			1 year 2 months 12 days
Compensation expense			$ 8,611	$ 7,390	$ 3,888
Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Measurement period of average distribution coverage ratio		3 years
Long-Term Incentive Plan, terms of award			The Partnership has a non-qualified, unfunded long-term incentive plan for officers and key employees (the “LTIP”) which provides for payment, in the form of cash, of an award of equity-based compensation at the end of a three-year performance period
Compensation expense			$ 1,814	120	1,439
Cash payouts			$ 0	$ 0	$ 0