Acquisitions and Dispositions (Details Textual) (Details)	12 Months Ended			0 Months Ended	1 Months Ended		12 Months Ended							12 Months Ended										0 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Jan. 12, 2012 Heritage Propane [Member] USD ($)	Jun. 30, 2012 Heritage Propane [Member] USD ($)	Apr. 30, 2012 Heritage Propane [Member] USD ($)	Sep. 30, 2012 Heritage Propane [Member] USD ($)	Dec. 31, 2011 Heritage Propane [Member] Customer gal	Oct. 31, 2011 UGI International [Member] USD ($)	Oct. 31, 2011 UGI International [Member] EUR (€)	Jan. 12, 2012 Energy Transfer Partners, LP [Member] States	Jan. 12, 2012 Heritage Operating LP [Member]	Jan. 12, 2012 Titan Energy GP LLC [Member]	Sep. 30, 2013 Amerigas [Member] USD ($)	Sep. 30, 2012 Amerigas [Member] USD ($)	Sep. 30, 2011 Amerigas [Member] USD ($)	Sep. 30, 2013 UGI International [Member] USD ($)	Sep. 30, 2011 UGI International [Member] USD ($)	Sep. 30, 2013 Atlantic Energy [Member] USD ($)	Jan. 12, 2012 Amerigas Partners Senior Notes Due 2020 [Member]	Jan. 12, 2012 Amerigas Partners Senior Notes Due 2020 [Member] Heritage Propane [Member] USD ($)	Jan. 12, 2012 Amerigas Partners Senior Notes Due 2022 [Member]	Jan. 12, 2012 Amerigas Partners Senior Notes Due 2022 [Member] Heritage Propane [Member] USD ($)	Jan. 12, 2012 General Partner [Member] Heritage Propane [Member] USD ($)
Business Acquisition [Line Items]
Purchase price of the acquisition				$ 2,598,200,000					$ 179,000,000	€ 133,600,000
Business acquired by parent through subsidiaries for cash				1,465,600,000			1,472,200,000
Common units issued by AmeriGas Partners (in units)				29,567,362
Business Acquisition, Cost of Acquired Entity, Equity Interests Issued and Issuable				1,132,600,000			1,132,600,000
Working Capital Adjustment, Additional Cash Paid						25,500,000
Purchase price adjustment cash received					18,900,000
Number of states in which business operates (in states)											41
Annual Delivery of Propane by Acquired Subsidiary (in gallons)								500,000,000
Number of Retail Customer (in customers)								1,000,000
Percentage of Contribution by Contributor in Form of Limited Partner Interest												99.999%	99.99%
Percentage of Contribution by Contributor in Form of Membership Interest												100.00%	100.00%
Percentage of Remaining Contribution by Contributor in Form of General Partner Interest				0.001%									0.01%
Partners' Capital Account, Units, Contributed																								934,327
Partners' Capital Account, Contributions																								41,700,000
Long-term Debt	3,609,400,000	3,514,300,000																			550,000,000		1,000,000,000
Interest rate stated percentage																				6.75%	6.75%	7.00%	7.00%
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents							60,700,000
Business Combination, Acquisition Related Costs							5,300,000
Cash consideration to acquire business	$ 78,900,000	$ 1,580,500,000	$ 52,500,000											$ 20	$ 13,500,000	$ 34,000,000	$ 36	$ 19,000,000	$ 23