Summary of Significant Accounting Policies (Details) $ in Millions	3 Months Ended
Dec. 31, 2014 USD ($)
Accounting Policies [Abstract]
Decrease in other comprehensive (loss) income	$ 14.4

Quantifying Immaterial Error, Not Corrected, Amount

No definition available.

Name:	ugi_QuantifyingImmaterialErrorNotCorrectedAmount
Namespace Prefix:	ugi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration