2.4.0.8 HtmlAndXml 171 167 1 false 56 0 false 9 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.ugi.com/role/DocumentAndEntityInformation Document and Entity Information R1.xml true false R2.htm 1001000 - Statement - Condensed Consolidated Balance Sheets (unaudited) Sheet http://www.ugi.com/role/CondensedConsolidatedBalanceSheetsUnaudited Condensed Consolidated Balance Sheets (unaudited) R2.xml false false R3.htm 1001501 - Statement - Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) Sheet http://www.ugi.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) R3.xml false false R4.htm 1002000 - Statement - Condensed Consolidated Statements of Income Sheet http://www.ugi.com/role/CondensedConsolidatedStatementsOfIncome Condensed Consolidated Statements of Income R4.xml false false R5.htm 1003000 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) Sheet http://www.ugi.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited Condensed Consolidated Statements of Comprehensive Income (unaudited) R5.xml false false R6.htm 1003501 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) Sheet http://www.ugi.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) R6.xml false false R7.htm 1004000 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.ugi.com/role/CondensedConsolidatedStatementsOfCashFlows Condensed Consolidated Statements of Cash Flows R7.xml false false R8.htm 2101100 - Disclosure - Nature of Operations Sheet http://www.ugi.com/role/NatureOfOperations Nature of Operations R8.xml false false R9.htm 2102100 - Disclosure - Significant Accounting Policies Sheet http://www.ugi.com/role/SignificantAccountingPolicies Significant Accounting Policies R9.xml false false R10.htm 2103100 - Disclosure - Accounting Changes Sheet http://www.ugi.com/role/AccountingChanges Accounting Changes R10.xml false false R11.htm 2104100 - Disclosure - Segment Information Sheet http://www.ugi.com/role/SegmentInformation Segment Information R11.xml false false R12.htm 2105100 - Disclosure - Inventories Sheet http://www.ugi.com/role/Inventories Inventories R12.xml false false R13.htm 2106100 - Disclosure - Regulatory Assets and Liabilities and Regulatory Matters Sheet http://www.ugi.com/role/RegulatoryAssetsAndLiabilitiesAndRegulatoryMatters Regulatory Assets and Liabilities and Regulatory Matters R13.xml false false R14.htm 2107100 - Disclosure - Defined Benefit Pension and Other Postretirement Plans Sheet http://www.ugi.com/role/DefinedBenefitPensionAndOtherPostretirementPlans Defined Benefit Pension and Other Postretirement Plans R14.xml false false R15.htm 2109100 - Disclosure - Commitments and Contingencies Sheet http://www.ugi.com/role/CommitmentsAndContingencies Commitments and Contingencies R15.xml false false R16.htm 2110100 - Disclosure - Related Party Transactions Sheet http://www.ugi.com/role/RelatedPartyTransactions Related Party Transactions R16.xml false false R17.htm 2111100 - Disclosure - Fair Value Measurements Sheet http://www.ugi.com/role/FairValueMeasurements Fair Value Measurements R17.xml false false R18.htm 2112100 - Disclosure - Disclosures About Derivative Instruments and Hedging Activities Sheet http://www.ugi.com/role/DisclosuresAboutDerivativeInstrumentsAndHedgingActivities Disclosures About Derivative Instruments and Hedging Activities R18.xml false false R19.htm 2202201 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.ugi.com/role/SignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) R19.xml false false R20.htm 2304301 - Disclosure - Segment Information (Tables) Sheet http://www.ugi.com/role/SegmentInformationTables Segment Information (Tables) R20.xml false false R21.htm 2305301 - Disclosure - Inventories (Tables) Sheet http://www.ugi.com/role/InventoriesTables Inventories (Tables) R21.xml false false R22.htm 2306301 - Disclosure - Regulatory Assets and Liabilities and Regulatory Matters (Tables) Sheet http://www.ugi.com/role/RegulatoryAssetsAndLiabilitiesAndRegulatoryMattersTables Regulatory Assets and Liabilities and Regulatory Matters (Tables) R22.xml false false R23.htm 2307301 - Disclosure - Defined Benefit Pension and Other Postretirement Plans (Tables) Sheet http://www.ugi.com/role/DefinedBenefitPensionAndOtherPostretirementPlansTables Defined Benefit Pension and Other Postretirement Plans (Tables) R23.xml false false R24.htm 2311301 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.ugi.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) R24.xml false false R25.htm 2312301 - Disclosure - Disclosures About Derivative Instruments and Hedging Activities (Tables) Sheet http://www.ugi.com/role/DisclosuresAboutDerivativeInstrumentsAndHedgingActivitiesTables Disclosures About Derivative Instruments and Hedging Activities (Tables) R25.xml false false R26.htm 2404402 - Disclosure - Segment Information (Details) Sheet http://www.ugi.com/role/SegmentInformationDetails Segment Information (Details) R26.xml false false R27.htm 2405402 - Disclosure - Inventories (Details) Sheet http://www.ugi.com/role/InventoriesDetails Inventories (Details) R27.xml false false R28.htm 2405403 - Disclosure - Inventories Textual (Details) Sheet http://www.ugi.com/role/InventoriesTextualDetails Inventories Textual (Details) R28.xml false false R29.htm 2406402 - Disclosure - Regulatory Assets and Liabilities and Regulatory Matters (Details) Sheet http://www.ugi.com/role/RegulatoryAssetsAndLiabilitiesAndRegulatoryMattersDetails Regulatory Assets and Liabilities and Regulatory Matters (Details) R29.xml false false R30.htm 2406403 - Disclosure - Regulatory Assets and Liabilities and Regulatory Matters Textual (Details) Sheet http://www.ugi.com/role/RegulatoryAssetsAndLiabilitiesAndRegulatoryMattersTextualDetails Regulatory Assets and Liabilities and Regulatory Matters Textual (Details) R30.xml false false R31.htm 2407402 - Disclosure - Defined Benefit Pension and Other Postretirement Plans (Details) Sheet http://www.ugi.com/role/DefinedBenefitPensionAndOtherPostretirementPlansDetails Defined Benefit Pension and Other Postretirement Plans (Details) R31.xml false false R32.htm 2407403 - Disclosure - Defined Benefit Pension and Other Postretirement Plans Textual (Details) Sheet http://www.ugi.com/role/DefinedBenefitPensionAndOtherPostretirementPlansTextualDetails Defined Benefit Pension and Other Postretirement Plans Textual (Details) R32.xml false false R33.htm 2409401 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.ugi.com/role/CommitmentsAndContingenciesDetails Commitments and Contingencies (Details) R33.xml false false R34.htm 2410401 - Disclosure - Related Party Transactions (Details) Sheet http://www.ugi.com/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) R34.xml false false R35.htm 2411402 - Disclosure - Fair Value Measurements (Details) Sheet http://www.ugi.com/role/FairValueMeasurementsDetails Fair Value Measurements (Details) R35.xml false false R36.htm 2411403 - Disclosure - Fair Value Measurements Textual (Details) Sheet http://www.ugi.com/role/FairValueMeasurementsTextualDetails Fair Value Measurements Textual (Details) R36.xml false false R37.htm 2412402 - Disclosure - Disclosures About Derivative Instruments and Hedging Activities Textual (Details) Sheet http://www.ugi.com/role/DisclosuresAboutDerivativeInstrumentsAndHedgingActivitiesTextualDetails Disclosures About Derivative Instruments and Hedging Activities Textual (Details) R37.xml false false R38.htm 2412403 - Disclosure - Disclosures About Derivative Instruments and Hedging Activities (Details) Sheet http://www.ugi.com/role/DisclosuresAboutDerivativeInstrumentsAndHedgingActivitiesDetails Disclosures About Derivative Instruments and Hedging Activities (Details) R38.xml false false R39.htm 2412404 - Disclosure - Disclosures About Derivative Instruments and Hedging Activities (Details 2) Sheet http://www.ugi.com/role/DisclosuresAboutDerivativeInstrumentsAndHedgingActivitiesDetails2 Disclosures About Derivative Instruments and Hedging Activities (Details 2) R39.xml false false All Reports Book All Reports Process Flow-Through: 1001000 - Statement - Condensed Consolidated Balance Sheets (unaudited) Process Flow-Through: Removing column 'Sep. 30, 2011' Process Flow-Through: 1001501 - Statement - Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) Process Flow-Through: 1002000 - Statement - Condensed Consolidated Statements of Income Process Flow-Through: 1003000 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) Process Flow-Through: 1003501 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) Process Flow-Through: 1004000 - Statement - Condensed Consolidated Statements of Cash Flows ugu-20130630.xml ugu-20130630.xsd ugu-20130630_cal.xml ugu-20130630_def.xml ugu-20130630_lab.xml ugu-20130630_pre.xml true true