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Energy Services Accounts Receivable Securitization Facility (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Energy services accounts receivable securitization facility (Textual) [Abstract] |  |
Receivables facility | $ 100 |
Energy Services [Member] |  |
Energy services accounts receivable securitization facility (Textual) [Abstract] |  |
Sale of trade receivables | 766.1 | 674.4
Energy Services Funding Corporation [Member] |  |
Energy services accounts receivable securitization facility (Textual) [Abstract] |  |
Sale of undivided interests in its trade receivables to the commercial paper conduit | 224.0 | 266.5
Outstanding balance of trade receivables | 58.2 | 41.0
Outstanding balance of trade receivables sold | $ 9.5 | $ 10.0

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- Definition Aggregate Trade Receivables Sold to Consolidated Special Purpose Subsidiary + References No definition available. + Details
Name: | ugi_AggregateTradeReceivablesSoldToConsolidatedSpecialPurposeSubsidiary
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ugi_EnergyServicesAccountsReceivableSecuritizationFacilityTextualAbstract
Namespace Prefix: | ugi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Outstanding balance of ESFC trade receivables. + References No definition available. + Details
Name: | ugi_OutstandingBalanceOfEsfcTradeReceivables
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Receivable purchase facility size. + References No definition available. + Details
Name: | ugi_ReceivablePurchaseFacility
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Trade receivables sold to commercial paper conduit. + References No definition available. + Details
Name: | ugi_TradeReceivablesSoldToCommercialPaperConduit
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromAccountsReceivableSecuritization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration