Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Significant Accounting Policies (Textual) [Abstract]
Decrease in income tax expense		$ 4.7
Ownership interests in certain subsidiaries under equity method investment, maximum	100.00%

Ownership interests in certain subsidiaries under equity method investment, maximum

No definition available.

Name:	ugi_OwnershipInterestsInCertainSubsidiariesUnderEquityMethodInvestmentMaximum
Namespace Prefix:	ugi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration