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Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on the Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Derivatives Not Designated as Hedging Instruments |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) recognized in income | $ (289.2)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 12.9 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Gain (loss) recognized in AOCI and Noncontrolling Interests | 11.6 ugi_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeAndNoncontrollingInterestsEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 48.0 ugi_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeAndNoncontrollingInterestsEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Gain (loss) reclassified from AOCI and Noncontrolling Interest into income | (3.6)ugi_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciAndNoncontrollingInterestIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 15.8 ugi_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciAndNoncontrollingInterestIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Commodity Contracts | Derivatives Not Designated as Hedging Instruments | Cost of Sales |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) recognized in income | (292.5)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 12.8 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Commodity Contracts | Derivatives Not Designated as Hedging Instruments | Revenues |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) recognized in income | 3.8 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesRevenueNetMember | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesRevenueNetMember
Commodity Contracts | Derivatives Not Designated as Hedging Instruments | Operating Expenses / Other Operating Income |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) recognized in income | (0.5)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = ugi_OperatingExpensesAndOtherIncomeMember | 0.1 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = ugi_OperatingExpensesAndOtherIncomeMember
Commodity Contracts | Cash Flow Hedges | Cost of Sales |  |
Derivative Instruments, Gain (Loss) |  |
Gain (loss) recognized in AOCI and Noncontrolling Interests | 0 ugi_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeAndNoncontrollingInterestsEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 53.4 ugi_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeAndNoncontrollingInterestsEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Gain (loss) reclassified from AOCI and Noncontrolling Interest into income | (2.4)ugi_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciAndNoncontrollingInterestIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 22.3 ugi_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciAndNoncontrollingInterestIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Foreign Currency Contracts | Cash Flow Hedges | Cost of Sales |  |
Derivative Instruments, Gain (Loss) |  |
Gain (loss) recognized in AOCI and Noncontrolling Interests | 8.7 ugi_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeAndNoncontrollingInterestsEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | (2.5)ugi_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeAndNoncontrollingInterestsEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Gain (loss) reclassified from AOCI and Noncontrolling Interest into income | 2.7 ugi_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciAndNoncontrollingInterestIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | (2.1)ugi_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciAndNoncontrollingInterestIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Cross Currency Contracts | Cash Flow Hedges | Interest Expense |  |
Derivative Instruments, Gain (Loss) |  |
Gain (loss) recognized in AOCI and Noncontrolling Interests | 2.1 ugi_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeAndNoncontrollingInterestsEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CrossCurrencyInterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember | (1.2)ugi_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeAndNoncontrollingInterestsEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CrossCurrencyInterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember
Gain (loss) reclassified from AOCI and Noncontrolling Interest into income | 0 ugi_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciAndNoncontrollingInterestIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CrossCurrencyInterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember | (0.3)ugi_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciAndNoncontrollingInterestIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CrossCurrencyInterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember
Interest rate contracts | Cash Flow Hedges | Interest Expense / Other Operating Income |  |
Derivative Instruments, Gain (Loss) |  |
Gain (loss) recognized in AOCI and Noncontrolling Interests | 0.8 ugi_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeAndNoncontrollingInterestsEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = ugi_InterestExpenseOtherIncomeMember | (1.7)ugi_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeAndNoncontrollingInterestsEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = ugi_InterestExpenseOtherIncomeMember
Gain (loss) reclassified from AOCI and Noncontrolling Interest into income | $ (3.9)ugi_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciAndNoncontrollingInterestIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = ugi_InterestExpenseOtherIncomeMember | $ (4.1)ugi_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciAndNoncontrollingInterestIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = ugi_InterestExpenseOtherIncomeMember

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- Definition Derivative instruments gain loss reclassified from other comprehensive income and noncontrolling interest into income effective portion. + References No definition available. + Details
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- Definition Derivative instruments gain loss recognized in other comprehensive income and noncontrolling interests effective portion. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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