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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | $ 34,457us-gaap_RegulatoryAssetsCurrent | $ 26,862us-gaap_RegulatoryAssetsCurrent
Regulatory assets-noncurrent | 351,218us-gaap_RegulatoryAssetsNoncurrent | 377,575us-gaap_RegulatoryAssetsNoncurrent
Regulatory liability-current | 12,115us-gaap_RegulatoryLiabilityCurrent | 6,072us-gaap_RegulatoryLiabilityCurrent
Regulatory liabilities-noncurrent | 71,623us-gaap_RegulatoryLiabilityNoncurrent | 61,326us-gaap_RegulatoryLiabilityNoncurrent
Conservation Incentive Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability-current | 12,115us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = njr_ConservationIncentiveProgramMember | 5,752us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = njr_ConservationIncentiveProgramMember
Regulatory liabilities-noncurrent | 14,781us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = njr_ConservationIncentiveProgramMember | 0us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = njr_ConservationIncentiveProgramMember
Derivatives at Fair Value, Net [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability-current | 0us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = njr_DerivativeNetCurrentMember | 320us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = njr_DerivativeNetCurrentMember
Cost of Removal Obligation [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 55,372us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RemovalCostsMember | 61,163us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RemovalCostsMember
Derivatives Net, Noncurrent [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 0us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = njr_DerivativesNetNoncurrentMember | 57us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = njr_DerivativesNetNoncurrentMember
Other [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 1,470us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = njr_OtherRegulatoryNoncurrentLiabilityMember | 106us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = njr_OtherRegulatoryNoncurrentLiabilityMember
New Jersey Clean Energy Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 6,492us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = njr_NewJerseyCleanEnergyProgramMember | 14,285us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = njr_NewJerseyCleanEnergyProgramMember
Derivatives at Fair Value, Net [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 24,759us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = njr_DerivativeNetCurrentMember | 0us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = njr_DerivativeNetCurrentMember
Underrecovered Gas Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 3,206us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRecoverableGasCostsMember | 12,577us-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 | 17,985us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_EnviromentalRemediationCostsExpendedNetOfRecoveriesMember | 30,916us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_EnviromentalRemediationCostsExpendedNetOfRecoveriesMember
Environmental Remediation Costs Liability for Future Expenditures [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 177,000us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember | 177,000us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember
Deferred Income Taxes [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 9,968us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredIncomeTaxChargesMember | 9,968us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredIncomeTaxChargesMember
SAVEGREEN [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 21,517us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_EnergyEfficiencyProgramMember | 29,180us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_EnergyEfficiencyProgramMember
Postemployment and Other Benefit Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 104,500us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_PensionAndOtherPostretirementPlansCostsMember | 108,507us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_PensionAndOtherPostretirementPlansCostsMember
Deferred Superstorm Sandy Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 15,207us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_StormCostsMember | 15,207us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_StormCostsMember
Other [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | $ 5,041us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_OtherRegulatoryAssetNoncurrentMember | $ 6,797us-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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