Condensed Financial Information of Registrant (Parent Company) - Statements of Income (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Condensed Financial Statements, Captions
Revenues	$ 1,311,400,000	$ 1,486,700,000	$ 3,163,300,000	$ 2,315,900,000	[1]	$ 1,259,000,000	[2]	$ 1,374,300,000	$ 2,542,700,000	$ 2,018,700,000	$ 8,277,300,000		$ 7,194,700,000		$ 6,521,300,000
Costs and Expenses
Operating and administrative expenses											1,752,600,000		1,692,000,000		1,591,100,000
Other income, net											(36,100,000)		(32,800,000)		(39,800,000)
Total costs and expenses											7,271,700,000		6,363,600,000		5,982,700,000
Operating (loss) income	(9,400,000)	62,700,000	588,600,000	363,700,000	[1]	(12,300,000)	[2]	41,500,000	507,700,000	294,200,000	1,005,600,000		831,100,000		538,600,000
Income tax expense											235,200,000		162,800,000		106,900,000
Equity in income of unconsolidated subsidiaries											(100,000)		(400,000)		(300,000)
Net income attributable to UGI Corporation	(19,800,000.0)	20,600,000.0	214,400,000.0	122,000,000.0	[1]	(14,200,000.0)	[2]	9,100,000.0	180,700,000.0	102,500,000.0	337,200,000.0		278,100,000.0		210,200,000.0
Earnings per common share:
Basic (in dollars per share)	$ (0.11)	$ 0.12	$ 1.24	$ 0.71	[1]	$ (0.08)	[2]	$ 0.05	$ 1.06	$ 0.60	$ 1.95		$ 1.63		$ 1.24
Diluted (in dollars per share)	$ (0.11)	$ 0.12	$ 1.22	$ 0.70	[1]	$ (0.08)	[2]	$ 0.05	$ 1.05	$ 0.60	$ 1.92		$ 1.60		$ 1.24
Average common shares outstanding (thousands):
Basic (in shares)											172,733		170,885		168,872
Diluted (in shares)											175,231		173,282		170,148
Parent Company
Condensed Financial Statements, Captions
Revenues											0		0		0
Costs and Expenses
Operating and administrative expenses											44,500,000		36,900,000		27,800,000
Other income, net											(44,200,000)	[3]	(36,700,000)	[3]	(28,100,000)	[3]
Total costs and expenses											300,000		200,000		(300,000)
Operating (loss) income											(300,000)		(200,000)		300,000
Intercompany interest income											200,000		200,000		200,000
(Loss) income before income taxes											(100,000)		0		500,000
Income tax expense											2,400,000		3,100,000		300,000
(Loss) income before equity in income of unconsolidated subsidiaries											(2,500,000)		(3,100,000)		200,000
Equity in income of unconsolidated subsidiaries											339,700,000		281,200,000		210,000,000
Net income attributable to UGI Corporation											$ 337,200,000.0		$ 278,100,000.0		$ 210,200,000.0
Earnings per common share:
Basic (in dollars per share)											$ 1.95		$ 1.63		$ 1.24
Diluted (in dollars per share)											$ 1.92		$ 1.60		$ 1.24
Average common shares outstanding (thousands):
Basic (in shares)											172,733		170,885		168,872
Diluted (in shares)											175,231		173,282		170,148

[1] Includes income tax expense of $5.7 to reflect the retroactive effects to Fiscal 2013 of new tax legislation in France regarding the deductibility of certain interest expense which decreased net income attributable to UGI Corporation by $5.7 or $0.03 per diluted share (see Note 7).

[2] Includes impairment loss on private equity partnership investment which increased operating loss by $6.3 and net loss attributable to UGI Corporation by $3.7 or $0.02 per share (see Note 2).

[3] UGI provides certain financial and administrative services to certain of its subsidiaries. UGI bills these subsidiaries monthly for all direct expenses incurred by UGI on behalf of its subsidiaries as well as allocated shares of indirect corporate expense incurred or paid with respect to services provided by UGI. The allocation of indirect UGI corporate expenses to certain of its subsidiaries utilizes a weighted, three-component formula comprising revenues, operating expenses, and net assets employed and considers the relative percentage of such items for each subsidiary to the total of such items for all UGI operating subsidiaries for which general and administrative services are provided. Management believes that this allocation method is reasonable and equitable to its subsidiaries. These billed expenses are classified as “Other income, net” in the Statements of Income above.