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Energy Services Accounts Receivable Securitization Facility (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 5 Months Ended | 7 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Oct. 31, 2015 | May 31, 2015
Energy Services |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |
Sale of trade receivables | $ 286.4 ugi_AggregateTradeReceivablesSoldToConsolidatedSpecialPurposeSubsidiary / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = ugi_EnergyServicesMember | $ 269.0 ugi_AggregateTradeReceivablesSoldToConsolidatedSpecialPurposeSubsidiary / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = ugi_EnergyServicesMember |  |
Energy Services Funding Corporation |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |
Sale of undivided interests in its trade receivables to the commercial paper conduit | 105.0 us-gaap_ProceedsFromAccountsReceivableSecuritization / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_CorporationMember | 92.0 us-gaap_ProceedsFromAccountsReceivableSecuritization / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_CorporationMember |  |
Outstanding balance of trade receivables | 96.5 ugi_OutstandingBalanceOfEsfcTradeReceivables / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_CorporationMember | 88.5 ugi_OutstandingBalanceOfEsfcTradeReceivables / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_CorporationMember |  |
Outstanding balance of trade receivables sold | 43.0 ugi_TradeReceivablesSoldToCommercialPaperConduit / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_CorporationMember | 35.5 ugi_TradeReceivablesSoldToCommercialPaperConduit / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_CorporationMember |  |
Forecast | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |
Receivables facility |  |  | $ 75 ugi_ReceivablePurchaseFacility / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 150 ugi_ReceivablePurchaseFacility / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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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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- 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: | duration

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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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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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=31042434&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromAccountsReceivableSecuritization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=ugi_EnergyServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=us-gaap_CorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |