Error in Method of Accounting For Certain Customer Credits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Mar. 31, 2013 Impact on net income attributable to UGI Corporation [Member]	Mar. 31, 2013 Impact on net income attributable to UGI Corporation [Member]	Sep. 30, 2012 Impact on net income attributable to UGI Corporation [Member] Prior fiscal year impact [Member]	Mar. 31, 2013 Revenues and accounts receivable [Member]	Mar. 31, 2013 Revenues and accounts receivable [Member]
Correction of Error [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ 1.2	$ 1.2		$ 7.0	$ 7.0
Impact of Customer Credit Adjustment			$ 0.7