Quarterly Data (Unaudited) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Revenues	$ 1,259.0	$ 1,374.3	$ 2,542.7	$ 2,018.7	$ 1,126.0	$ 1,280.7	$ 2,427.8	$ 1,686.8	$ 7,194.7		$ 6,521.3		$ 6,090.9
Cost of sales (excluding depreciation shown below)	785.4	836.8	1,486.7	1,215.5	659.8	792.7	1,524.3	1,122.3
Operating and administrative expenses	396.1	407.5	461.5	426.9	400.1	404.5	443.8	342.7	1,692.0		1,591.1		1,267.0
Utility taxes other than income taxes	4.2	3.7	4.7	4.3	4.4	3.9	4.9	4.1	16.9		17.3		16.6
Depreciation	78.5	76.4	74.0	72.5	72.4	69.4	68.5	52.9	301.4		263.2		201.0
Amortization	15.4	15.4	15.6	15.3	15.1	15.1	14.1	7.5	61.7		51.8		26.7
Other income, net	(8.3)	(7.0)	(7.5)	(10.0)	(10.8)	(8.1)	(12.8)	(8.1)	(32.8)		(39.8)		(45.5)
Total costs and expenses	1,271.3	1,332.8	2,035.0	1,724.5	1,141.0	1,277.5	2,042.8	1,521.4	6,363.6		5,982.7		5,448.5
Operating income	(12.3)	41.5	507.7	294.2	(15.0)	3.2	385.0	165.4	831.1		538.6		642.4
Loss from equity investees	(0.5)		0.1		(0.1)	(0.1)		(0.1)	(0.4)		(0.3)		(0.9)
(Loss) gain on extinguishments of debt					0	0.1	(13.4)	0			(13.3)		(38.1)
Interest expense	(59.5)	(59.2)	(60.1)	(61.5)	(61.0)	(60.9)	(62.5)	(36.0)	(240.3)		(220.4)		(138.0)
Income before income taxes	(72.3)	(17.7)	447.7	232.7	(76.1)	(57.7)	309.1	129.3	590.4		304.6		465.4
Income taxes	13.2	(5.1)	(106.0)	(64.9)	7.7	(4.1)	(77.2)	(33.3)	(162.8)		(106.9)		(145.4)
Net income (loss)	(59.1)	(22.8)	341.7	167.8	(68.4)	(61.8)	231.9	96.0	427.6		197.7		320.0
(Deduct net income) add net loss attributable to noncontrolling interests, principally in AmeriGas Partners	44.9	31.9	(161.0)	(65.3)	62.1	67.1	(95.6)	(21.1)	(149.5)		12.5		(74.6)
Net income (loss) attributable to UGI Corporation	(14.2)	9.1	180.7	102.5	(6.3)	5.3	136.3	74.9	278.1		210.2		245.4
Earnings (loss) per share attributable to UGI stockholders:
Basic (in dollars per share)	$ (0.12)	$ 0.08	$ 1.59	$ 0.91	$ (0.06)	$ 0.05	$ 1.21	$ 0.67	$ 2.44		$ 1.87		$ 2.20
Diluted (in dollars per share)	$ (0.12)	$ 0.08	$ 1.57	$ 0.90	$ (0.06)	$ 0.05	$ 1.20	$ 0.66	$ 2.41		$ 1.85		$ 2.17
Shares used in computing basic and diluted earnings per share
Basic (in shares)	114,598	114,240	113,709	113,136	112,868	112,726	112,510	112,240	113,923	[1]	112,581	[1]	111,674
Diluted (in shares)	114,598	116,196	115,199	114,490	112,868	113,504	113,239	113,152	115,521	[1]	113,432	[1]	112,944
As Previously Reported
Revenues		1,372.3	2,537.1	2,023.2	1,125.7	1,277.2	2,427.5	1,688.8
Cost of sales (excluding depreciation shown below)		827.9	1,500.6	1,218.8	672.6	810.2	1,526.6	1,101.8
Operating and administrative expenses		404.7	465.8	426.9	400.2	405.8	443.3	342.4			1,591.7		1,266.4
Utility taxes other than income taxes		3.7	4.7	4.3	4.4	3.9	4.9	4.1
Depreciation		76.5	71.7	71.8	73.2	69.5	68.7	52.8			264.2		201.2
Amortization		15.4	15.6	15.3	15.1	15.1	14.1	7.5
Other income, net		(9.0)	(7.5)	(10.0)	(11.2)	(8.1)	(10.9)	(8.1)			(38.3)		(46.5)
Total costs and expenses		1,319.2	2,050.9	1,727.1	1,154.3	1,296.4	2,046.7	1,500.5
Operating income		53.1	486.2	296.1	(28.6)	(19.2)	380.8	188.3			521.3		616.0
Loss from equity investees			0.1		(0.1)	(0.1)		(0.1)
(Loss) gain on extinguishments of debt					0	0.1	(13.4)	0
Interest expense		(59.2)	(60.1)	(60.3)	(58.9)	(61.3)	(65.3)	(36.0)			(221.5)		(138.0)
Income before income taxes		(6.1)	426.2	235.8	(87.6)	(80.5)	302.1	152.2			286.2		439.0
Income taxes		(9.0)	(100.0)	(65.1)	13.6	4.0	(75.1)	(42.1)			(99.6)		(130.8)
Net income (loss)		(15.1)	326.2	170.7	(74.0)	(76.5)	227.0	110.1			186.6		308.2
(Deduct net income) add net loss attributable to noncontrolling interests, principally in AmeriGas Partners		29.8	(154.3)	(68.1)	59.3	70.2	(93.6)	(23.1)			12.8		(75.3)
Net income (loss) attributable to UGI Corporation		14.7	171.9	102.6	(14.7)	(6.3)	133.4	87.0			199.4		232.9
Earnings (loss) per share attributable to UGI stockholders:
Basic (in dollars per share)		$ 0.13	$ 1.51	$ 0.91	$ (0.13)	$ (0.06)	$ 1.19	$ 0.78			$ 1.77		$ 2.09
Diluted (in dollars per share)		$ 0.13	$ 1.49	$ 0.90	$ (0.13)	$ (0.06)	$ 1.18	$ 0.77			$ 1.76		$ 2.06
Shares used in computing basic and diluted earnings per share
Basic (in shares)		114,240	113,709	113,136	112,868	112,726	112,510	112,240
Diluted (in shares)		116,196	115,199	114,490	112,868	112,726	113,239	113,152
Adjustment
Revenues		2.0	5.6	(4.5)	0.3	3.5	0.3	(2.0)
Cost of sales (excluding depreciation shown below)		8.9	(13.9)	(3.3)	(12.8)	(17.5)	(2.3)	20.5
Operating and administrative expenses		2.8	(4.3)		(0.1)	(1.3)	0.5	0.3			(0.6)		0.6
Utility taxes other than income taxes
Depreciation		(0.1)	2.3	0.7	(0.8)	(0.1)	(0.2)	0.1			(1.0)		(0.2)
Amortization
Other income, net		2.0			0.4		(1.9)				(1.5)		1.0
Total costs and expenses		13.6	(15.9)	(2.6)	(13.3)	(18.9)	(3.9)	20.9
Operating income		(11.6)	21.5	(1.9)	13.6	22.4	4.2	(22.9)			17.3		26.4
Loss from equity investees
(Loss) gain on extinguishments of debt					0	0	0	0
Interest expense				(1.2)	(2.1)	0.4	2.8				1.1
Income before income taxes		(11.6)	21.5	(3.1)	11.5	22.8	7.0	(22.9)			18.4		26.4
Income taxes		3.9	(6.0)	0.2	(5.9)	(8.1)	(2.1)	8.8			(7.3)		(14.6)
Net income (loss)		(7.7)	15.5	(2.9)	5.6	14.7	4.9	(14.1)			11.1		11.8
(Deduct net income) add net loss attributable to noncontrolling interests, principally in AmeriGas Partners		2.1	(6.7)	2.8	2.8	(3.1)	(2.0)	2.0			(0.3)		0.7
Net income (loss) attributable to UGI Corporation		(5.6)	8.8	(0.1)	8.4	11.6	2.9	(12.1)			10.8		12.5
Earnings (loss) per share attributable to UGI stockholders:
Diluted (in dollars per share)		$ (0.05)	$ 0.08	$ 0.00	$ 0.07	$ 0.10	$ 0.03	$ (0.11)			$ 0.09		$ 0.11
Midstream & Marketing hedge accounting | Adjustment
Operating income		(6.9)	12.5	0.7	15.5	18.5	2.2	(19.3)			17.0		27.6
Net income (loss) attributable to UGI Corporation		(4.1)	7.3	0.4	9.1	10.8	1.3	(11.3)			10.0		16.2
Earnings (loss) per share attributable to UGI stockholders:
Diluted (in dollars per share)		$ (0.04)	$ 0.06	$ 0.00	$ 0.08	$ 0.10	$ 0.01	$ (0.10)			$ 0.09		$ 0.14
Partnership customer credits | Adjustment
Operating income		0	7.0	(2.8)	(1.4)	3.2	(0.4)	(3.2)			(1.8)		0.1
Net income (loss) attributable to UGI Corporation		0	1.1	(0.4)	(0.2)	0.5	(0.1)	(0.8)			(0.6)		0
Earnings (loss) per share attributable to UGI stockholders:
Diluted (in dollars per share)		$ 0.00	$ 0.01	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.01)			$ 0.00		$ 0.00
Other | Adjustment
Operating income		(4.7)	2.0	0.2	(0.5)	0.7	2.4	(0.4)			2.1		(1.3)
Net income (loss) attributable to UGI Corporation		$ (1.5)	$ 0.4	$ (0.1)	$ (0.5)	$ 0.3	$ 1.7	$ 0			$ 1.4		$ (3.7)
Earnings (loss) per share attributable to UGI stockholders:
Diluted (in dollars per share)		$ (0.01)	$ 0.01	$ 0.00	$ (0.01)	$ 0.00	$ 0.02	$ 0.00			$ 0.00		$ (0.03)

[1] For Fiscal 2013, Fiscal 2012 and Fiscal 2011, there were approximately 88 shares, 81 shares and 3,700 shares, respectively, associated with outstanding stock option awards that were not included in the computation of diluted earnings per share above because their effect was antidilutive.