DEBT - CREDIT FACILITIES (Details) (USD $)
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Mar. 31, 2015
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Oct. 24, 2014
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Sep. 30, 2014
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NJR [Member] | Letter of Credit [Member] |
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Line of Credit Facility [Line Items] |
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Letters of credit outstanding, amount |
$ 7,700,000us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = njr_NjrMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LetterOfCreditMember |
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$ 20,500,000us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = njr_NjrMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LetterOfCreditMember |
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NJR [Member] | Revolving Credit Facility [Member] |
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Line of Credit Facility [Line Items] |
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Bank credit facilities |
425,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = njr_NjrMember |
[1] |
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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] |
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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] |
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Line of Credit Facility [Line Items] |
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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 |
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148,000,000us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember |
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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 |
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1.08%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember |
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NJR [Member] | Bank Revolving Credit Facility [Member] |
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Line of Credit Facility [Line Items] |
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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 |
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0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = njr_BankCreditFacilitiesShortTermMember / dei_LegalEntityAxis = njr_NjrMember |
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NJNG [Member] | Letter of Credit [Member] |
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Line of Credit Facility [Line Items] |
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Letters of credit outstanding, amount |
731,000us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = njr_NjngMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LetterOfCreditMember |
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731,000us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = njr_NjngMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LetterOfCreditMember |
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NJNG [Member] | Revolving Credit Facility [Member] |
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Line of Credit Facility [Line Items] |
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Bank credit facilities |
250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = njr_NjngMember |
[1] |
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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] |
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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] |
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Line of Credit Facility [Line Items] |
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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 |
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$ 153,000,000us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CommercialPaperMember |
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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 |
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0.12%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CommercialPaperMember |
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