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DEBT - CREDIT FACILITIES (Details) (USD $)
Mar. 31, 2015
Oct. 24, 2014
Sep. 30, 2014
NJR [Member] | Letter of Credit [Member]      
Line of Credit Facility [Line Items]      
Letters of credit outstanding, amount $ 7,700,000us-gaap_LettersOfCreditOutstandingAmount
/ dei_LegalEntityAxis
= njr_NjrMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember
  $ 20,500,000us-gaap_LettersOfCreditOutstandingAmount
/ dei_LegalEntityAxis
= njr_NjrMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember
NJR [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Bank credit facilities 425,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjrMember
[1]   425,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjrMember
[1]
Amount available at end of period 417,345,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjrMember
[2]   256,484,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjrMember
[2]
NJR [Member] | Revolving Credit Facility [Member] | Notes Payable to Banks [Member]      
Line of Credit Facility [Line Items]      
Amount outstanding at end of period 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjrMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
  148,000,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjrMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
Weighted average interest rate at end of period 0.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjrMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
  1.08%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjrMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
NJR [Member] | Bank Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Bank credit facilities 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= njr_BankCreditFacilitiesShortTermMember
/ dei_LegalEntityAxis
= njr_NjrMember
[3] 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= njr_BankCreditFacilitiesShortTermMember
/ dei_LegalEntityAxis
= njr_NjrMember
0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= njr_BankCreditFacilitiesShortTermMember
/ dei_LegalEntityAxis
= njr_NjrMember
[3]
Amount available at end of period 100,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= njr_BankCreditFacilitiesShortTermMember
/ dei_LegalEntityAxis
= njr_NjrMember
  0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= njr_BankCreditFacilitiesShortTermMember
/ dei_LegalEntityAxis
= njr_NjrMember
NJNG [Member] | Letter of Credit [Member]      
Line of Credit Facility [Line Items]      
Letters of credit outstanding, amount 731,000us-gaap_LettersOfCreditOutstandingAmount
/ dei_LegalEntityAxis
= njr_NjngMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember
  731,000us-gaap_LettersOfCreditOutstandingAmount
/ dei_LegalEntityAxis
= njr_NjngMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember
NJNG [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Bank credit facilities 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjngMember
[1]   250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjngMember
[1]
Amount available at end of period 103,269,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjngMember
[4]   96,269,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjngMember
[4]
NJNG [Member] | Revolving Credit Facility [Member] | Commercial Paper [Member]      
Line of Credit Facility [Line Items]      
Amount outstanding at end of period $ 146,000,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjngMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CommercialPaperMember
  $ 153,000,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjngMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CommercialPaperMember
Weighted average interest rate at end of period 0.18%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjngMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CommercialPaperMember
  0.12%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= njr_NjngMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CommercialPaperMember
[1] Committed credit facilities, which require commitment fees on the unused amounts.
[2] Letters of credit outstanding total $7.7 million and $20.5 million as of March 31, 2015 and September 30, 2014, respectively, which reduces amount available by the same amount.
[3] Uncommitted credit facilities, which require no commitment fees.
[4] Letters of credit outstanding total $731,000 and $731,000 as of March 31, 2015 and September 30, 2014, respectively, which reduces the amount available by the same amount.