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DEBT - SCHEDULE OF LONG TERM DEBT (Details) (USD $) | 6 Months Ended | 0 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Sep. 26, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 15, 2015 | Mar. 13, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from sale-leaseback transaction | $ 7,216,000us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities | $ 7,576,000us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities |  |  |  |  |
NJR [Member] | Debt Shelf Facility Prudential [Member] | Unsecured Senior Note 3.25% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount issued and outstanding | 50,000,000us-gaap_LineOfCredit / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityPrudentialMember / us-gaap_LongtermDebtTypeAxis = njr_UnsecuredSeniorNote325Member |  |  |  |  |  |
Interest rate, stated percentage | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityPrudentialMember / us-gaap_LongtermDebtTypeAxis = njr_UnsecuredSeniorNote325Member |  |  |  |  |  |
NJR [Member] | Debt Shelf Facility Prudential [Member] | Unsecured Senior Note 3.48% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage | 3.48%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityPrudentialMember / us-gaap_LongtermDebtTypeAxis = njr_Unsecuredseniornote3.48Member |  |  |  |  |  |
Debt issued | 100,000,000us-gaap_LongTermDebt / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityPrudentialMember / us-gaap_LongtermDebtTypeAxis = njr_Unsecuredseniornote3.48Member |  |  |  |  |  |
NJR [Member] | Debt Shelf Facility Metlife 2 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityMetlife2Member |  |  |  |
Line of credit facility, issuance period |  |  | 3 years |  |  |  |
Line of credit facility, remaining borrowing capacity | 100,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityMetlife2Member |  |  |  |  |  |
NJR [Member] | Debt Shelf Facility Metlife [Member] | Unsecured Senior Note 1.94% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount issued and outstanding | 25,000,000us-gaap_LineOfCredit / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityMetlifeMember / us-gaap_LongtermDebtTypeAxis = njr_UnsecuredSeniorNote194Member |  |  |  |  |  |
Interest rate, stated percentage | 1.94%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityMetlifeMember / us-gaap_LongtermDebtTypeAxis = njr_UnsecuredSeniorNote194Member |  |  |  |  |  |
Number of debt instruments outstanding | 2njr_NumberofDebtInstruments / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityMetlifeMember / us-gaap_LongtermDebtTypeAxis = njr_UnsecuredSeniorNote194Member |  |  |  |  |  |
NJR [Member] | Debt Shelf Facility Metlife [Member] | Unsecured Senior Note 2.51% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount issued and outstanding | 25,000,000us-gaap_LineOfCredit / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityMetlifeMember / us-gaap_LongtermDebtTypeAxis = njr_UnsecuredSeniorNote251Member |  |  |  |  |  |
Interest rate, stated percentage | 2.51%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = njr_NjrMember / us-gaap_LineOfCreditFacilityAxis = njr_DebtShelfFacilityMetlifeMember / us-gaap_LongtermDebtTypeAxis = njr_UnsecuredSeniorNote251Member |  |  |  |  |  |
NJNG [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from sale-leaseback transaction |  |  |  | 7,200,000us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities / dei_LegalEntityAxis = njr_NjngMember | 7,600,000us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities / dei_LegalEntityAxis = njr_NjngMember |  |
NJNG [Member] | First Mortgage [Member] | 2.82% Senior Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 2.82%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = njr_TwoPointEightyTwoPercentSeniorNotesMember / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongtermDebtTypeAxis = us-gaap_FirstMortgageMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Debt issued |  |  |  |  |  | 50,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = njr_TwoPointEightyTwoPercentSeniorNotesMember / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongtermDebtTypeAxis = us-gaap_FirstMortgageMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
NJNG [Member] | First Mortgage [Member] | 3.66% Senior Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 3.66%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = njr_ThreePointSixtySixPercentSeniorNotesMember / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongtermDebtTypeAxis = us-gaap_FirstMortgageMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Debt issued |  |  |  |  |  | 100,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = njr_ThreePointSixtySixPercentSeniorNotesMember / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongtermDebtTypeAxis = us-gaap_FirstMortgageMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
NJNG [Member] | First Mortgage [Member] | 3.58% Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 3.58%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = njr_ThreePointFiftyEightPercentSeniorNotesMember / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongtermDebtTypeAxis = us-gaap_FirstMortgageMember
Debt issued |  |  |  |  |  |  | 70,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = njr_ThreePointFiftyEightPercentSeniorNotesMember / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongtermDebtTypeAxis = us-gaap_FirstMortgageMember
NJNG [Member] | First Mortgage [Member] | 4.61% Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 4.61%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = njr_FourPointSixtyOnePercentSeniorNotesMember / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongtermDebtTypeAxis = us-gaap_FirstMortgageMember
Debt issued |  |  |  |  |  |  | $ 55,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = njr_FourPointSixtyOnePercentSeniorNotesMember / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongtermDebtTypeAxis = us-gaap_FirstMortgageMember

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- Definition Line of Credit Facility, Issuance period + References No definition available. + Details
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- Definition Number of Debt Instruments + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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- 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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- 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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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: 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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- Definition Amount of cash inflow after closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 + Details
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