Regulatory Assets and Liabilities and Regulatory Matters Textual (Details) (USD $)	0 Months Ended					12 Months Ended			3 Months Ended	0 Months Ended
	Oct. 21, 2010	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Dec. 01, 2010 mi	Sep. 30, 2013 UGI Central Penn Gas Inc [Member]	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Maximum [Member]	Mar. 31, 2012 UGI Storage Company [Member] UGI Central Penn Gas Inc [Member]	Oct. 03, 2012 Allentown, Pennsylvania Natural Gas Explosion [Member] Damage from Natural Gas Explosion [Member]	Feb. 19, 2013 Revised Penalty [Member] Allentown Incident [Member]
Schedule of 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		$ (1,743,000)	$ 5,303,000
Fair value of electric utility electricity supply contracts		4,759,000	9,207,000
Minimum period to recover costs related to other regulatory assets		1 year
Maximum period to recover costs related to other regulatory assets		5 years
Penalty Assessed											500
Site Contingency, Accelerated Time Frame Replacing Remainder of Cast-Iron Mains										14 years
Loss Contingency, Agreement Permitted To Retain Current Timeframe for Replacing The Remainder of Their Bare Steel Mains										30 years
Additional base rate revenue using for increased distribution rates per settlement agreement						8,000,000
Base rate revenue increase for use in CPG's Energy and Efficiency Program						900,000
Reversal of Previous Increase in Base Rate Revenue						900,000
Net book value of the Auburn line		2,650,000			1,109,000
Agreement To Charge Customers, Period	3 years
Net book value of the storage facility assets				10,949,000
Deferred Tax Assets, Regulatory Assets and Liabilities		$ 384		$ 308,000	$ 180,000
Storage agreement, term									1 year
Approval of the transfer length of natural gas pipeline (in miles)					9