Debt (UGI Utilities) (Narrative) (Details) (UGI Utilities 2011 Credit Agreement [Member], USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2012 Letter of Credit [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Maximum [Member]
Debt Instrument [Line Items]
Credit agreement		$ 300
Revolving Credit Agreement Sublimit for Letters of Credit			100
Margin on Credit Agreement Base Rate Borrowings				0.00%	2.00%
Borrowings outstanding, amount		9.2
Line of Credit Facility, Interest Rate at Period End		1.21%
Letters of Credit Outstanding, Amount	$ 2.0	$ 2.0
Ratio of consolidated debt to consolidated capital	0.65