Public Offerings (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Aug. 14, 2012	Sep. 29, 2012	Sep. 24, 2011	Sep. 25, 2010
Sale of Partnership Units [Line Items]
Number of common units sold (in units)	6,300,000
Proceeds received from public offering, net		$ 259,842	$ 0	$ 0
Repayments of borrowings		225,000	0	0
Public Offering [Member]
Sale of Partnership Units [Line Items]
Date of partnership units sold		Aug. 14, 2012
Number of common units sold (in units)		6,300,000
Price per common unit sold in a public offering (in dollars per unit)		$ 37.61
Proceeds received from public offering, net		225,722
Over Allotment Option [Member]
Sale of Partnership Units [Line Items]
Date of partnership units sold		Aug. 20, 2012
Number of common units sold (in units)		945,000
Price per common unit sold in a public offering (in dollars per unit)		$ 37.61
Proceeds received from public offering, net		$ 34,120