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Energy Services Accounts Receivable Securitization Facility (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Energy services accounts receivable securitization facility (Additional Textual) [Abstract] |  |
Receivables facility | $ 200 |
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 | 79.5 | 94.0
Outstanding balance of trade receivables | 69.3 | 78.4
Outstanding balance of trade receivables sold | 33.0 | 33.2
Energy Services [Member] |  |
Energy services accounts receivable securitization facility (Textual) [Abstract] |  |
Sale of trade receivables | $ 224.3 | $ 251.2

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: | ugi_
Data Type: | xbrli:stringItemType
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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 Sale of trade receivables to consolidated special purpose subsidiary. + References No definition available. + Details
Name: | ugi_SaleOfTradeReceivablesToConsolidatedSpecialPurposeSubsidiary
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
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration