Acquisition of Inergy Propane (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 30, 2013	Mar. 24, 2012	Mar. 30, 2013	Mar. 24, 2012
Unaudited pro forma combined financial information [Abstract]
Revenues	$ 678,426	$ 679,784	$ 1,169,129	$ 1,275,152
Net income	$ 131,152	$ 77,781	$ 190,940	$ 110,117
Income per common unit [Abstract]
Basic (in dollars per unit)	$ 2.29	$ 1.39	$ 3.34	$ 1.96
Diluted (in dollars per unit)	$ 2.28	$ 1.38	$ 3.33	$ 1.96