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Derivative Instruments and Hedging Activities (Details) | 6 Months Ended |  |  |  |  |  |  |  | 6 Months Ended |  |  | 6 Months Ended |  |
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Mar. 31, 2015 USD ($) gal | Mar. 31, 2014 USD ($) gal | Sep. 30, 2014 USD ($) | Mar. 31, 2015 Brokerage Accounts USD ($) | Mar. 31, 2014 Brokerage Accounts USD ($) | Mar. 31, 2015 Interest Rate Swaps EUR (€) | Mar. 31, 2014 Interest Rate Swaps EUR (€) | Mar. 31, 2015 Interest Rate Protection Agreements USD ($) | Mar. 31, 2014 Interest Rate Protection Agreements USD ($) | Mar. 31, 2015 Foreign Currency USD ($) | Mar. 31, 2014 Foreign Currency USD ($) | Sep. 30, 2013 Cross Currency Contracts USD ($) | Mar. 31, 2015 Gas Utility MMBTU | Mar. 31, 2014 Gas Utility MMBTU | Mar. 31, 2015 Electric Utility kWh | Mar. 31, 2014 Electric Utility kWh | Mar. 31, 2015 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Purchase Contracts kWh | Mar. 31, 2014 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Purchase Contracts kWh | Mar. 31, 2015 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Sales Contracts kWh | Mar. 31, 2014 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Sales Contracts kWh | Mar. 31, 2015 Midstream & Marketing Propane Storage (millions of dekatherms) Forward Sales Contracts gal | Mar. 31, 2014 Midstream & Marketing Propane Storage (millions of dekatherms) Forward Sales Contracts gal | Mar. 31, 2015 Midstream & Marketing Gas Utility Natural Gas Forward Purchase Contracts MMBTU | Mar. 31, 2014 Midstream & Marketing Gas Utility Natural Gas Forward Purchase Contracts MMBTU | Mar. 31, 2015 Midstream & Marketing Natural Gas Storage Forward Sales Contracts MMBTU | Mar. 31, 2014 Midstream & Marketing Natural Gas Storage Forward Sales Contracts MMBTU | Mar. 31, 2015 Midstream & Marketing FTR and NYISO Contracts Electric transmission congestion (excluding Electric Utility) kWh | Mar. 31, 2014 Midstream & Marketing FTR and NYISO Contracts Electric transmission congestion (excluding Electric Utility) kWh | Mar. 31, 2015 Net Investment Hedging EUR (€) | Mar. 31, 2014 Net Investment Hedging EUR (€)
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of LPG commodity derivatives (in gallons) | 362,500,000 us-gaap_DerivativeNonmonetaryNotionalAmountVolume | 121,900,000 us-gaap_DerivativeNonmonetaryNotionalAmountVolume |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_DerivativeNonmonetaryNotionalAmountVolume / us-gaap_DerivativeByNatureAxis = ugi_PropaneStorageMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 0 us-gaap_DerivativeNonmonetaryNotionalAmountVolume / us-gaap_DerivativeByNatureAxis = ugi_PropaneStorageMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | € 401,100,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_InterestRateSwapsMember | € 439,800,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_InterestRateSwapsMember | $ 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_InterestRateProtectionAgreementsMember | $ 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_InterestRateProtectionAgreementsMember | $ 223,500,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_ForeignCurrencyMember | $ 199,400,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ugi_ForeignCurrencyMember | $ 52,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CrossCurrencyInterestRateContractMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_NetInvestmentHedgingMember | € 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_NetInvestmentHedgingMember
Maximum length of time hedging exposure to LPG commodity price risk | 45 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  | 9,700,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_StatementBusinessSegmentsAxis = ugi_GasUtilityMember | 9,000,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_StatementBusinessSegmentsAxis = ugi_GasUtilityMember | 384,400,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_StatementBusinessSegmentsAxis = ugi_ElectricUtilityMember | 207,000,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_StatementBusinessSegmentsAxis = ugi_ElectricUtilityMember | 356,000,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_DerivativeByNatureAxis = ugi_ElectricityMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 603,100,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_DerivativeByNatureAxis = ugi_ElectricityMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 315,400,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_DerivativeByNatureAxis = ugi_ElectricityMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 346,100,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_DerivativeByNatureAxis = ugi_ElectricityMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember |  |  | 61,600,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_DerivativeByNatureAxis = ugi_GasUtilityNaturalGasMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 65,100,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_DerivativeByNatureAxis = ugi_GasUtilityNaturalGasMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 600,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_DerivativeByNatureAxis = ugi_NaturalGasStorageMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 100,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_DerivativeByNatureAxis = ugi_NaturalGasStorageMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 124,600,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_DerivativeByNatureAxis = ugi_ElectricTransmissionCongestionExcludingElectricUtilityMember / us-gaap_DerivativeInstrumentRiskAxis = ugi_FTRandNYISOContractsMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember | 482,500,000 us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure / us-gaap_DerivativeByNatureAxis = ugi_ElectricTransmissionCongestionExcludingElectricUtilityMember / us-gaap_DerivativeInstrumentRiskAxis = ugi_FTRandNYISOContractsMember / us-gaap_StatementBusinessSegmentsAxis = ugi_MidstreamAndMarketingMember |  |
Maximum length of time hedged in price risk cash flow hedges |  |  |  |  |  |  |  |  |  | 35 months |  |  | 12 months |  | 14 months |  | 24 months |  | 18 months |  |  |  | 42 months |  |  |  | 2 months |  |  |
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months | 2,600,000 us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months | 19,500,000 us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 56,700,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | $ 4,400,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | $ 16,600,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | $ 56,700,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_DerivativeByNatureAxis = ugi_BrokerageAccountsMember | $ 4,400,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_DerivativeByNatureAxis = ugi_BrokerageAccountsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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