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INCOME TAXES (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate | 24.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 28.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Forecasted annual ITC for effective tax rate calculation |  |  | $ 18,700,000njr_ForecastedAnnualITCforEffectiveTaxRateCalculation |
Forecasted annual PTC for effective tax rate calculation |  |  | 187,000njr_ForecastedAnnualPTCforEffectiveTaxRateCalculation |
ITC carryforward, expiration period |  |  | 20 years |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 181,000,000us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  | 153,200,000us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Net operating loss carryforwards, expiration term | 20 years |  |  |
Deferred tax assets, operating loss carryforwards | 10,600,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  | 9,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Valuation allowance | 213,000us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  | 212,000us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
ITC carryforward |  |  | 7,500,000us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
Forecast [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Forecasted annual ITC for effective tax rate calculation |  |  |  | 24,500,000njr_ForecastedAnnualITCforEffectiveTaxRateCalculation / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
Forecasted annual PTC for effective tax rate calculation |  |  |  | $ 2,200,000njr_ForecastedAnnualPTCforEffectiveTaxRateCalculation / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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