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COMMON STOCK EQUITY - DIVIDEND REINVESTMENT PLAN (Details) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Equity [Abstract] |  |
Equity raised through the DRP | $ 7.7us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan | $ 7.4us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan
Number of treasury shares issued from raising of equity through the DRP | 152,000us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan | 163,000us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Additional equity raised | $ 19.8njr_StockIssuedDuringPeriodValueDividendReinvestmentPlanWaiverDiscountFeature |
Additional shares issued through the waiver discount feature of the DRP | 344,000njr_StockIssuedDuringPeriodSharesDividendReinvestmentPlanWaiverDiscountFeature | 0njr_StockIssuedDuringPeriodSharesDividendReinvestmentPlanWaiverDiscountFeature

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- Definition Number of shares issued during the period from a DRP waiver discount feature. + References No definition available. + Details
Name: | njr_StockIssuedDuringPeriodSharesDividendReinvestmentPlanWaiverDiscountFeature
Namespace Prefix: | njr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Value of stock issued during the period from a DRP waiver discount feature. NJR can waive the $100,000 limit on initial and optional cash investments upon request by an investor and offer a discount up to 3%. + References No definition available. + Details
Name: | njr_StockIssuedDuringPeriodValueDividendReinvestmentPlanWaiverDiscountFeature
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_EquityAbstract
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Amount of cash inflow from capital contributions to an entity associated with a dividend reinvestment plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration