Partnership Acquisition of Heritage Propane (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended						3 Months Ended	6 Months Ended					0 Months Ended
	Mar. 31, 2012	Mar. 31, 2012	Apr. 30, 2012	Mar. 31, 2011	Mar. 31, 2012 Acquisition [Member] gal	Jan. 12, 2012 AmeriGas Partners Senior Notes Due Two [Member]	Jan. 12, 2012 AmeriGas Partners Senior Notes Due One [Member]	Mar. 31, 2012 Heritage [Member]	Mar. 31, 2012 Heritage [Member]	Jan. 12, 2012 Heritage [Member] Acquisition [Member]	Jan. 12, 2012 Titan [Member] Acquisition [Member]	Jan. 12, 2012 Energy Transfer Partners, L.P. [Member] Acquisition [Member] States	Jan. 12, 2012 Heritage Propane [Member] Customer	Jan. 12, 2012 Heritage Propane [Member] Acquisition [Member]	Jan. 12, 2012 Heritage Propane [Member] AmeriGas Partners Senior Notes Due Two [Member] Acquisition [Member]	Jan. 12, 2012 Heritage Propane [Member] AmeriGas Partners Senior Notes Due One [Member] Acquisition [Member]
Acquisition (Textual) [Abstract]
Purchase price of the acquisition														$ 2,598.2
Business acquired by parent through subsidiaries for cash								1,491.1	1,491.1					1,465.6
Common units issued by AmeriGas Partners		29,567,362												29,567,362
Consideration in AmeriGas Partners Common Units	1,132.6	1,132.6												1,132.6
Working capital adjustment, additional cash paid			25.5
Number of states in which business operates												41
Annual delivery of propane by subsidiary					500,000,000
Number of retail customer													1,000,000
Percentage of Limited partner interest										99.999%	99.99%
Percentage of membership interest										100.00%	100.00%
Percentage of general partner interest											0.01%			0.001%
Number of common units contributed by Entity														934,327
Fair value of common stock														41.7
Percentage senior notes due						7.00%	6.75%								7.00%	6.75%
Proceeds from issuance of Senior notes	3,612.8	3,612.8		2,066.0											1,000.0	550.0
Maturity dates of Notes issued															2022	2020
Operating and administrative costs								3.6	4.7
Revenue of transaction costs								404.2
Working capital adjustment and cash acquired													60.7
Operating income as result of heritage acquisition								97
Acquisition (Textual Additional) [Abstract]
Efforts to sell subsidiary to third party description	To the extent that the gross proceeds of ETP’s sale of HPX exceed $40, AmeriGas Partners will receive a share of such excess and, to the extent such gross proceeds of the sale of HPX are less than such amount, AmeriGas Partners will pay Contributor an amount equal to the shortfall.
Working capital adjustment of notes	25.5	25.5
Gross proceeds of sale	$ 40