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RELATED PARTY TRANSACTIONS (Details) (USD $)
6 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 01, 2010
Sep. 30, 2014
Bcf
Related Party Transaction [Line Items]        
Number of asset management agreements 3njr_NumberofAssetManagementAgreements      
NJRES to Steckman RIdge and Iroquios Affliates [Member]        
Related Party Transaction [Line Items]        
Demand fees expense recognized pertaining to related party agreement $ 3,200,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjresToSteckmanRidgeAndIroquiosAffliatesMember
$ 1,500,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjresToSteckmanRidgeAndIroquiosAffliatesMember
   
NJRES to Steckman Ridge Affiliate        
Related Party Transaction [Line Items]        
Due to related parties 280,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjresToSteckmanRidgeAfffiliateMember
    187,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjresToSteckmanRidgeAfffiliateMember
NJRES to Iroquois Affiliate [Member]        
Related Party Transaction [Line Items]        
Due to related parties 513,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjresToIroquoisAffiliateMember
    389,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjresToIroquoisAffiliateMember
NJNG to Steckman RIdge Affiliate        
Related Party Transaction [Line Items]        
Related party agreement term     10 years  
Agreement for natural gas storage capacity between NJNG and affiliate (Bcf) 3njr_AgreementforNaturalGasStorageCapacityBetweenNJNGandAffiliate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjngToSteckmanRidgeAffiliateMember
     
Approximate annual demand fees under agreement from April 1 2010 to March 31 2020     9,300,000njr_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 3,200,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjngToSteckmanRidgeAndIroquiosAffiliatesMember
4,800,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjngToSteckmanRidgeAndIroquiosAffiliatesMember
   
Due to related parties $ 768,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjngToSteckmanRidgeAndIroquiosAffiliatesMember
    823,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NjngToSteckmanRidgeAndIroquiosAffiliatesMember
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       0.18njr_NaturalGasTransportationCapacityUnderPrecedentAgreementfromNJNGWithPennEast
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= njr_NJNGtoPennEastAffiliateMember