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Unit-Based Compensation Arrangements - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 06, 2013
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Restricted Stock Units (RSUs) [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total number of Common Units authorized for issuance (in units)   2,400,000    
Restricted Unit Plans, terms of award   In accordance with an August 6, 2013 amendment to the Restricted Unit Plan, 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 Plan 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 Plan 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 Plan.    
Unrecognized compensation cost   $ 3,861    
Weighted-average recognition period of compensation cost   1 year 2 months 12 days    
Compensation expense   $ 8,256 $ 8,611 $ 7,390
Long-Term Incentive Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Long-Term Incentive Plan, terms of award   The LTIP is a non-qualified, unfunded, long-term incentive plan for officers and key employees that provides for payment, in the form of cash, of an award of equity-based compensation at the end of a three-year performance period.    
Measurement period of average distribution coverage ratio 3 years      
Compensation expense   $ (1,362) 1,814 120
Cash payouts   $ 1,473 $ 0 $ 0