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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) (USD $)
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]    
Expected reclassification from OCI into earnings $ (204,000)us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months  
Maximum tenor 2 months 30 days  
NJNG [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative instruments, gain (loss) recognized in regulatory assets and liabilities net (19,000,000)njr_DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetsAndLiabilitiesNet
/ dei_LegalEntityAxis
= njr_NjngMember		 6,600,000njr_DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetsAndLiabilitiesNet
/ dei_LegalEntityAxis
= njr_NjngMember
Cash Flow Hedging [Member] | Foreign Currency Contract [Member] | Gas Purchases [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) (24,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 [1] (151,000)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) (25,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 97,000us-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
Not Designated as Hedging Instrument [Member] | NJRES [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in income on derivatives 113,956,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= njr_NjresMember		 (65,145,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= njr_NjresMember
Not Designated as Hedging Instrument [Member] | Physical Commodity Contracts [Member] | Operating Revenues [Member] | NJRES [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in income on derivatives 16,091,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
/ dei_LegalEntityAxis
= njr_NjresMember		 (82,000)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
Not Designated as Hedging Instrument [Member] | Physical Commodity Contracts [Member] | Gas Purchases [Member] | NJRES [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in income on derivatives (19,856,000)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		 (24,993,000)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
Not Designated as Hedging Instrument [Member] | Financial Commodity Contracts [Member] | Gas Purchases [Member] | NJRES [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in income on derivatives $ 117,721,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ dei_LegalEntityAxis
= njr_NjresMember		 $ (40,070,000)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
[1] The settlement of foreign currency transactions over the next 12 months is expected to result in the reclassification of $(204,000) from OCI into earnings. The maximum tenor is April 2015