Acquisition of Inergy Propane (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 29, 2012	Dec. 24, 2011
Unaudited pro forma combined financial information [Abstract]
Revenues	$ 490,703	$ 595,368
Net income	$ 59,788	$ 32,568
Income per common unit [Abstract]
Basic (in dollars per unit)	$ 1.05	$ 0.58
Diluted (in dollars per unit)	$ 1.04	$ 0.58