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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014
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Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | $ 36,842 us-gaap_RegulatoryAssetsCurrent | $ 26,862 us-gaap_RegulatoryAssetsCurrent
Regulatory assets-noncurrent | 369,176 us-gaap_RegulatoryAssetsNoncurrent | 377,575 us-gaap_RegulatoryAssetsNoncurrent
Regulatory liability-current | 0 us-gaap_RegulatoryLiabilityCurrent | 6,072 us-gaap_RegulatoryLiabilityCurrent
Regulatory liabilities-noncurrent | 65,328 us-gaap_RegulatoryLiabilityNoncurrent | 61,326 us-gaap_RegulatoryLiabilityNoncurrent
Derivatives at Fair Value, Net [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability-current | 0 us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = njr_DerivativeNetCurrentMember | 320 us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = njr_DerivativeNetCurrentMember
Conservation Incentive Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability-current | 0 us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = njr_ConservationIncentiveProgramMember | 5,752 us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = njr_ConservationIncentiveProgramMember
Cost of Removal Obligation [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 58,723 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RemovalCostsMember | 61,163 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RemovalCostsMember
Derivatives Net, Noncurrent [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 0 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = njr_DerivativesNetNoncurrentMember | 57 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = njr_DerivativesNetNoncurrentMember
Other [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 6,605 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = njr_OtherRegulatoryNoncurrentLiabilityMember | 106 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = njr_OtherRegulatoryNoncurrentLiabilityMember
New Jersey Clean Energy Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 13,166 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = njr_NewJerseyCleanEnergyProgramMember | 14,285 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = njr_NewJerseyCleanEnergyProgramMember
Derivatives at Fair Value, Net [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 18,866 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = njr_DerivativeNetCurrentMember | 0 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = njr_DerivativeNetCurrentMember
Conservation Incentive Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 1,556 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = njr_ConservationIncentiveProgramMember | 0 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = njr_ConservationIncentiveProgramMember
Underrecovered Gas Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 3,254 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRecoverableGasCostsMember | 12,577 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRecoverableGasCostsMember
Environmental Remediation Costs Expended, Net of Recoveries [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 26,226 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_EnviromentalRemediationCostsExpendedNetOfRecoveriesMember | 30,916 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_EnviromentalRemediationCostsExpendedNetOfRecoveriesMember
Environmental Remediation Costs Liability for Future Expenditures [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 177,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember | 177,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember
Deferred Income Taxes [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 9,968 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredIncomeTaxChargesMember | 9,968 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredIncomeTaxChargesMember
SAVEGREEN [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 28,411 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_EnergyEfficiencyProgramMember | 29,180 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_EnergyEfficiencyProgramMember
Postemployment and Other Benefit Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 106,503 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_PensionAndOtherPostretirementPlansCostsMember | 108,507 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_PensionAndOtherPostretirementPlansCostsMember
Deferred Superstorm Sandy Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 15,207 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_StormCostsMember | 15,207 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_StormCostsMember
Other [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | $ 5,861 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_OtherRegulatoryAssetNoncurrentMember | $ 6,797 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_OtherRegulatoryAssetNoncurrentMember

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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