Common Stock And Equity Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended						3 Months Ended	12 Months Ended														0 Months Ended	1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended
	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 Employee Stock Option [Member]	Sep. 30, 2013 Equity Instruments Other Than Option [Member]	Sep. 30, 2013 Omnibus Equity Compensation Plan [Member]	Dec. 31, 2012 2010 Propane Plan [Member]	Sep. 30, 2013 2010 Propane Plan [Member]	Sep. 30, 2012 2010 Propane Plan [Member]	Sep. 30, 2011 2010 Propane Plan [Member]	Sep. 30, 2013 UGI Stock Units [Member]		Sep. 30, 2012 UGI Stock Units [Member]	Sep. 30, 2011 UGI Stock Units [Member]	Sep. 30, 2013 UGI Performance Units [Member]	Sep. 30, 2012 UGI Performance Units [Member]	Sep. 30, 2011 UGI Performance Units [Member]	Sep. 30, 2013 AmeriGas Performance Unit [Member]	Sep. 30, 2012 AmeriGas Performance Unit [Member]	Sep. 30, 2011 AmeriGas Performance Unit [Member]	Jun. 30, 2010 AmeriGas Performance Unit [Member]	Jan. 12, 2012 Heritage Propane [Member]	Mar. 31, 2012 Noncontrolling interests	Sep. 30, 2013 Noncontrolling interests	Sep. 30, 2012 Noncontrolling interests	Sep. 30, 2011 Noncontrolling interests	Mar. 31, 2012 AmeriGas Partners [Member]	Sep. 30, 2013 2004 OECP [Member] UGI Performance Units [Member]	Sep. 30, 2013 2013 OICP [Member] UGI Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common units issued by AmeriGas Partners (in units)																							29,567,362
Units sold in public offering																												7,000,000
Increase in Stockholders' Equity, Net of Deferred Income Taxes	$ 196.3
Adjustments to reflect change in ownership of AmeriGas Partners, net of tax																								(321.4)	0	(321.4)	0
Pre-tax equity-based compensation expense		17.6	14.5	15.6
After tax equity-based compensation expense		11.4	8.7	10.3
Options can be exercised																			no later than ten years from the grant date
Granted Under Plan Term (in years)		10 years
Shares of UGI Common Stock granted as awards					14,500,000																	2,800,000
Cash received from stock option exercises		30.8	9.4	22.9
Associated tax benefits		12.1	2.3	3.8
Unrecognized compensation cost associated with unvested Amerigas unit awards		5.4										8.3							3.0
Weighted-average fair value of stock option granted under stock plans		$ 4.93	$ 4.31	$ 5.40					$ 42.58	$ 43.22	$ 53.19					$ 37.97	$ 27.25	$ 35.19
Award performance period																														3 years
Target award paid to employee																													grantees may receive 0% to 200% of the target award granted. For such grants, if UGI’s TSR ranks below the 40th percentile compared to the UGI comparator group, the employee will not be paid. At the 40th percentile, the employee will be paid an award equal to 50% of the target award; at the 50th percentile, 100%; and at the 100th percentile, 200%	grantees may receive 0% to 200% of the target award granted. For such grants, if UGI’s TSR ranks below the 25th percentile compared to the UGI comparator group, the employee will not be paid. At the 40th percentile, the employee will be paid an award equal to 70% of the target award; at the 50th percentile, 100%; and at the 90th percentile, 200%
Minimum percentage amount of guarantee on target award granted																													0.00%	0.00%
Maximum percentage amount of guarantee on target award granted																													200.00%	200.00%
Percentage of target award paid at 40th percentile																													50.00%	70.00%
Percentage of target award paid at 50th percentile																													100.00%	100.00%
Percentage of target award paid at 100th percentile																													200.00%	200.00%
Expected term of Performance Unit awards																3 years			3 years
Shares granted under UGI Stock Unit awards		approximately 70% in shares
Number of UGI Units, Granted		254,600	239,845	285,470					65,136	248,818	49,287	34,025	[1]	42,445	61,945	220,575			44,800
Weighted average grant date fair value unit awards		$ 37.31	$ 27.68	$ 34.78								$ 33.05	[1]			$ 37.97			$ 42.36
Unrecognized compensation cost associated with common unit												920,601							224,168
Weighted-average period for unvested Amerigas unit awards		1 year 10 months 24 days										2 years 0 months 0 days							1 year 10 months
Performance units ultimately paid								3 years
Number of common units subject to original awards granted						187,543	13,449,649		2,484,839
Fair value of AmeriGas units vested												6.0		3.6	6.8				2.8	5.1	2.0
Liabilities associated with share based compensation												$ 8.0		$ 5.0					$ 1.1	$ 1.1

[1] Generally, shares granted under UGI Stock Unit awards are paid approximately 70% in shares. UGI Stock Unit awards granted in Fiscal 2012 and Fiscal 2011 were 42,445 and 61,945, respectively.