Utility Regulatory Assets and Liabilities and Regulatory Matters (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			12 Months Ended				0 Months Ended
	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 01, 2010 mi	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 UGI Central Penn Gas Inc [Member]	Jan. 14, 2011 UGI Central Penn Gas Inc [Member]	Oct. 03, 2012 Allentown, Pennsylvania Natural Gas Explosion [Member] UGI Utilities [Member] Claims	Feb. 09, 2011 Allentown, Pennsylvania Natural Gas Explosion [Member] UGI Utilities [Member] Person
Regulatory Assets and Liabilities [Line Items]
Average remaining depreciable lives of the associated property					1 year	50 years
Unrealized gains (losses) on derivative financial instruments contracts		$ (5.3)	$ (3.1)
Fair value of electric utility electricity supply contracts		9.2	8.7
Minimum period to recover costs related to other regulatory assets		1 year
Maximum period to recover costs related to other regulatory assets		5 years
Maximum Percentage of Incremental Operating Margin Traditional Ratemaking		5.00%
Deaths From Natural Gas Explosion (in person)										5
Alleged committed violations (in claims)									6
Damages paid									0.4
Accelerated Time Frame Replacing Remainder of Cast-Iron Mains									14 years
Agreement to not Seek Recovery of Related Annual Cost of Capital Return Requirements									24 months
Loss Contingency, Agreement Permitted To Retain Current Timeframe for Replacing The Remainder of Their Bare Steel Mains									30 years
Request to increase base operating revenues to fund system improvements and operations								16.5
Additional base rate revenue using for increased distribution rates per settlement agreement							8.0
Increase in Base Rate Revenue for Energy and Efficiency Conservation Program							0.9
Reversal of Previous Increase in Base Rate Revenue for Energy and Efficiency Conservation Program							0.9
Net book value of the storage facility assets			10.9
Term Period of Senior Facilities Agreement	1 year
Approval of the transfer length of natural gas pipeline (in miles)				9
Net book value of the Auburn line				$ 1.1