Public Offerings (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended				0 Months Ended
	Jun. 29, 2013	Jun. 23, 2012	Aug. 06, 2013 Senior Note Due 2021 [Member]	Aug. 02, 2013 Senior Note Due 2021 [Member]	May 17, 2013 Public Offering [Member]	May 22, 2013 Over Allotment Option [Member]
Sale of Partnership Units [Line Items]
Number of common units sold (in units)					2,700	405
Price per common unit sold in a public offering (in dollars per unit)					$ 48.16	$ 48.16
Proceeds received from public offering, net	$ 143,444	$ 0			$ 124,684	$ 18,760
Repayments of borrowings			$ 23,900	$ 133,400