Acquisition of Heritage Propane (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Summary of pro forma consolidated results of operations
Revenues	$ 876,647	$ 1,106,198
Net income attributable to AmeriGas Partners, L.P.	$ 96,665	$ 58,312
Income per limited partner unit
Basic (in dollars per unit)	$ 0.93	$ 0.64
Diluted (in dollars per unit)	$ 0.93	$ 0.64