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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) (USD $) | 3 Months Ended | 6 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Expected reclassification from OCI into earnings | $ (18,000)us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months |  |  |  | $ (18,000)us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months |  |  |
Maximum tenor |  |  |  |  | 0 months 24 days |  |  |
Foreign Currency Contract [Member] | Gas Purchases [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) | (381,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | [1] | (309,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | [1] | (405,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | [1] | (460,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | [1]
Amount of Gain or (Loss) Reclassified from OCI into Income (Effective Portion) | 567,000us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  | 68,000us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  | 542,000us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  | 165,000us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |
Amount of Gain or (Loss) Recognized on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) | 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  | 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  | 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  | 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |
NJRES [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (18,285,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember |  | (214,026,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember |  | 95,671,000us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember |  | (279,171,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember |
NJRES [Member] | Not Designated as Hedging Instrument [Member] | Physical Commodity Contracts [Member] | Operating Revenues [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (1,144,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = njr_NjresMember |  | (57,916,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = njr_NjresMember |  | 14,947,000us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = njr_NjresMember |  | (57,998,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = njr_NjresMember |
NJRES [Member] | Not Designated as Hedging Instrument [Member] | Physical Commodity Contracts [Member] | Gas Purchases [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 10,063,000us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / dei_LegalEntityAxis = njr_NjresMember |  | (54,481,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / dei_LegalEntityAxis = njr_NjresMember |  | (9,793,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / dei_LegalEntityAxis = njr_NjresMember |  | (79,474,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / dei_LegalEntityAxis = njr_NjresMember |
NJRES [Member] | Not Designated as Hedging Instrument [Member] | Financial Commodity Contracts [Member] | Gas Purchases [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (27,204,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / dei_LegalEntityAxis = njr_NjresMember |  | (101,629,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / dei_LegalEntityAxis = njr_NjresMember |  | 90,517,000us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / dei_LegalEntityAxis = njr_NjresMember |  | (141,699,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / dei_LegalEntityAxis = njr_NjresMember |
NJNG [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Derivative instruments, gain (loss) recognized in regulatory assets and liabilities net | $ (5,500,000)njr_DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetsAndLiabilitiesNet / dei_LegalEntityAxis = njr_NjngMember |  | $ 6,200,000njr_DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetsAndLiabilitiesNet / dei_LegalEntityAxis = njr_NjngMember |  | $ (24,500,000)njr_DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetsAndLiabilitiesNet / dei_LegalEntityAxis = njr_NjngMember |  | $ 12,800,000njr_DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetsAndLiabilitiesNet / dei_LegalEntityAxis = njr_NjngMember |
[1] | The settlement of foreign currency transactions over the next 12 months is expected to result in the reclassification of $(18,000) from OCI into earnings. The maximum tenor is April 2015

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and 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 (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + 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 (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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