Debt (AmeriGas Propane) (Narrative) (Details) (USD $)	3 Months Ended				12 Months Ended					1 Months Ended	12 Months Ended		0 Months Ended	1 Months Ended	12 Months Ended		1 Months Ended		3 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended						12 Months Ended							12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 Amerigas Partners Senior Notes Due 2020 [Member]	Jan. 12, 2012 Amerigas Partners Senior Notes Due 2020 [Member]	Jun. 30, 2012 Amerigas Partners Senior Notes Due 2022 [Member]	Sep. 30, 2013 Amerigas Partners Senior Notes Due 2022 [Member]	Jan. 12, 2012 Amerigas Partners Senior Notes Due 2022 [Member]	Mar. 28, 2012 6.50% Senior Note Due May 2021 [Member]	Jan. 31, 2011 6.50% Senior Note Due May 2021 [Member]	Sep. 30, 2012 6.50% Senior Note Due May 2021 [Member]	Jan. 12, 2012 6.50% Senior Note Due May 2021 [Member]	Feb. 28, 2011 7.25%, Due, May 2015 [Member]	Feb. 28, 2011 8.875%, Due May 2011 [Member]	Mar. 31, 2012 8.875%, Due May 2011 [Member]	Aug. 31, 2011 6.25%, Due August 2019 [Member]	Sep. 30, 2012 6.25%, Due August 2019 [Member]	Aug. 31, 2011 7.125%, Due May 2016 [Member]	Sep. 30, 2011 7.125%, Due May 2016 [Member]	Sep. 30, 2013 AmeriGas 2011 Credit Agreement [Member]	Sep. 30, 2012 AmeriGas 2011 Credit Agreement [Member]	Jun. 30, 2011 AmeriGas 2011 Credit Agreement [Member]	Jun. 30, 2011 AmeriGas 2011 Credit Agreement [Member] Letter of Credit [Member]	Sep. 30, 2012 Ameri Gas Predecessor Credit Agreement [Member]	Sep. 30, 2012 Minimum [Member] AmeriGas 2011 Credit Agreement [Member]	Sep. 30, 2012 Maximum [Member] AmeriGas 2011 Credit Agreement [Member]	Sep. 30, 2013 Amerigas Propane [Member]	Sep. 30, 2012 Amerigas Propane [Member]	Sep. 30, 2011 Amerigas Propane [Member]	Sep. 30, 2013 Amerigas Propane [Member] 6.25%, Due August 2019 [Member]	Sep. 30, 2012 Amerigas Propane [Member] 6.25%, Due August 2019 [Member]	Sep. 30, 2013 Amerigas Propane [Member] HOLP Senior Secured Notes [Member]	Sep. 30, 2012 Amerigas Propane [Member] HOLP Senior Secured Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount									$ 550,000,000			$ 1,000,000,000
Interest rate stated percentage									6.75%			7.00%				6.50%	7.25%	8.875%		6.25%		7.125%												6.25%
Guaranteed Debt					1,500,000,000
Percentage of Redemption at Option								35.00%							35.00%						35.00%
Debt Tendered for Redemption													383,500,000
Percentage of Aggregate Amount Outstanding Tendered													82.00%
Principal amount outstanding before redemption													470,000,000
Proceeds from issuance of senior notes														470,000,000						450,000,000
Redemption Value of Senior Notes																200,000,000
Early Redemption Percentage of Senior Notes													105.00%
Percentage of proration factor (as a percent)													52.30%
Repayments of Long-term Debt					168,700,000	299,900,000	1,383,600,000			19,200,000.0
Repayments of Senior Debt																	415,000,000	14,600,000				350,000,000
Loss on extinguishments of debt	0	100,000	(13,400,000)	0		(13,300,000)	(38,100,000)				(13,300,000)								(18,800,000)				(19,300,000)									(13,300,000)	(38,100,000)
Reduction in net income attributable to UGI Corporation due to extinguishment loss					2,200,000	5,200,000	5,200,000
Long-term Debt	3,514,300,000				3,609,400,000	3,514,300,000																									2,300,100,000	2,328,000,000		450,000,000	450,000,000	32,000,000	55,600,000
Unamortized Premium																																				3,700,000
Interest Rate, Stated Percentage Rate Range, Minimum																																				7.89%
Interest Rate, Stated Percentage Rate Range, Maximum																																				8.87%
Effective interest rate																																				6.75%
Credit agreement																										525,000,000
Rate of Interest above Federal Fund Rate																								0.50%
Revolving credit agreement sublimit for letters of credit																											125,000,000
Margin on Credit Agreement Base Rate Borrowings																													0.75%	1.75%
Margin on credit agreement Eurodollar rate borrowings																													1.75%	2.75%
Credit Agreement Facility Fee Rate																													0.30%	0.50%
Borrowings outstanding, amount																								116,900,000				49,900,000
Line of Credit Facility, Interest Rate at Period End																								2.69%	2.72%
Credit agreement outstanding, amount																								$ 53,700,000				$ 47,900,000