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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | $ 60,013us-gaap_DerivativeAssetsCurrent | $ 64,223us-gaap_DerivativeAssetsCurrent
Derivative liabilities, current | 84,626us-gaap_DerivativeLiabilitiesCurrent | 79,863us-gaap_DerivativeLiabilitiesCurrent
Derivative assets, noncurrent | 5,141us-gaap_DerivativeAssetsNoncurrent | 5,654us-gaap_DerivativeAssetsNoncurrent
Derivative liabilities, noncurrent | 3,598us-gaap_DerivativeLiabilitiesNoncurrent | 6,690us-gaap_DerivativeLiabilitiesNoncurrent
Derivative assets | 65,154us-gaap_DerivativeAssets | 69,877us-gaap_DerivativeAssets
Derivative liabilities | 88,224us-gaap_DerivativeLiabilities | 86,553us-gaap_DerivativeLiabilities
Notional amount of foreign currency derivatives | 101invest_DerivativeNotionalAmount |
Designated as Hedging Instrument [Member] | NJRES [Member] | Foreign Currency Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 0us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = njr_NjresMember | 0us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = njr_NjresMember
Derivative liabilities, current | 18us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = njr_NjresMember | 155us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = njr_NjresMember
Derivative assets | 0us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = njr_NjresMember | 0us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = njr_NjresMember
Derivative liabilities | 18us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = njr_NjresMember | 155us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = njr_NjresMember
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 65,154us-gaap_DerivativeAssets / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 69,877us-gaap_DerivativeAssets / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivative liabilities | 88,206us-gaap_DerivativeLiabilities / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 86,398us-gaap_DerivativeLiabilities / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Financial Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 48,725us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember | 46,307us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember
Derivative liabilities, current | 47,442us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember | 46,725us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember
Derivative assets, noncurrent | 4,446us-gaap_DerivativeAssetsNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember | 5,537us-gaap_DerivativeAssetsNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember
Derivative liabilities, noncurrent | 3,598us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember | 6,533us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember
Not Designated as Hedging Instrument [Member] | NJRES [Member] | Physical Forward Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 10,381us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember | 15,391us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember
Derivative liabilities, current | 11,521us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember | 30,778us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember
Derivative assets, noncurrent | 695us-gaap_DerivativeAssetsNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember | 35us-gaap_DerivativeAssetsNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember
Derivative liabilities, noncurrent | 0us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember | 132us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjresMember
Not Designated as Hedging Instrument [Member] | NJNG [Member] | Financial Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, current | 907us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjngMember | 2,525us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjngMember
Derivative liabilities, current | 25,645us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjngMember | 2,205us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjngMember
Derivative assets, noncurrent | 0us-gaap_DerivativeAssetsNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjngMember | 82us-gaap_DerivativeAssetsNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjngMember
Derivative liabilities, noncurrent | $ 0us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjngMember | $ 25us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = njr_NjngMember

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