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DEBT - CREDIT FACILITIES (Details) (USD $) | Mar. 31, 2015 | Oct. 24, 2014 | Sep. 30, 2014
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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.

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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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