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RELATED PARTY TRANSACTIONS (Details) (USD $) | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 MMcf
Related Party Transaction [Line Items] |  |  |
Number of asset management agreements | 3 njr_NumberofAssetManagementAgreements |  |
NJRES to Steckman RIdge and Iroquios Affliates [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Demand fees expense recognized pertaining to related party agreement | $ 1,600,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjresToSteckmanRidgeAndIroquiosAffliatesMember | $ 1,600,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjresToSteckmanRidgeAndIroquiosAffliatesMember |
NJRES to Steckman Ridge Affiliate |  |  |
Related Party Transaction [Line Items] |  |  |
Due to related parties | 301,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjresToSteckmanRidgeAfffiliateMember |  | 187,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjresToSteckmanRidgeAfffiliateMember
NJRES to Iroquois Affiliate [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Due to related parties | 420,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjresToIroquoisAffiliateMember |  | 389,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjresToIroquoisAffiliateMember
NJNG to Steckman RIdge Affiliate |  |  |
Related Party Transaction [Line Items] |  |  |
Due to related parties | 775,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjngToSteckmanRidgeAffiliateMember |  | 775,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjngToSteckmanRidgeAffiliateMember
Related party agreement term | 10 years |  |
Agreement for natural gas storage capacity between NJNG and affiliate (MMcf) | 3,000 njr_AgreementforNaturalGasStorageCapacityBetweenNJNGandAffiliate / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjngToSteckmanRidgeAffiliateMember |  |
Approximate annual demand fees under agreement from April 1 2010 to March 31 2020 | 9,300,000 njr_ProjectedAnnualDemandFeesUnderRelatedPartyAgreement / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjngToSteckmanRidgeAffiliateMember |  |
NJNG to Steckman RIdge and Iroquios Affiliates [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Demand fees expense recognized pertaining to related party agreement | 1,600,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjngToSteckmanRidgeAndIroquiosAffiliatesMember | 1,700,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjngToSteckmanRidgeAndIroquiosAffiliatesMember |
NJNG to Iroquois Affiliate [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Due to related parties | $ 61,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjngToIroquoisAffiliateMember |  | 48,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NjngToIroquoisAffiliateMember
NJNG to PennEast Affiliate [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Natural Gas Transportation Capacity under Precedent Agreement from NJNG with PennEast, period | 15 years |  |
Natural Gas Transportation Capacity under Precedent Agreement from NJNG with PennEast |  |  | 180 njr_NaturalGasTransportationCapacityUnderPrecedentAgreementfromNJNGWithPennEast / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = njr_NJNGtoPennEastAffiliateMember

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- Definition Carrying amount as of the balance sheet date of obligations due all related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(3),(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 3, 4 -Article 9 + Details
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