Unit-Based Compensation Arrangements (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		0 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Aug. 06, 2013	Sep. 27, 2014
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)	1,902,122
Aggregate grant date fair value of restricted units awarded	$ 5,804
Unrecognized compensation cost	11,059
Weighted-average recognition period of compensation cost	1 year 2 months 12 days
Compensation expense	2,890	1,638
Units [Rollforward]
Outstanding, beginning of period (in units)	694,927
Awarded (in units)	154,403
Forfeited (in units)	(3,548)
Issued (in units)	(141,034)
Outstanding, end of period (in units)	704,748
Weighted Average Grant Date Fair Value Per Unit [Abstract]
Outstanding, beginning of period (in dollars per unit)	$ 32.07
Awarded (in dollars per unit)	$ 37.59
Forfeited (in dollars per unit)	$ (31.01)
Issued (in dollars per unit)	$ (36.59)
Outstanding, end of period (in dollars per unit)	$ 32.38
Long-Term Incentive Plan [Member]
Long-Term Incentive Plan [Abstract]
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	1,198	1,352
Liability included within accrued employment and benefit costs (or other liabilities, as applicable) related to estimated future payments under the LTIP	$ 4,245			$ 3,047
2014 Long Term Incentive Plan [Member]
Weighted Average Grant Date Fair Value Per Unit [Abstract]
Measurement period of average distribution coverage ratio			3 years