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DEBT - SCHEDULE OF LONG TERM DEBT (Details) (USD $) | 6 Months Ended | 24 Months Ended |  |  | 6 Months Ended |  | 6 Months Ended | 3 Months Ended | 1 Months Ended |  | 1 Months Ended | 6 Months Ended |  | 0 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | May 10, 2013 NJR [Member] Debt Shelf Facility Metlife [Member] | Mar. 31, 2013 NJR [Member] Debt Shelf Facility Metlife [Member] | Mar. 31, 2014 NJR [Member] Debt Shelf Facility Metlife [Member] Unsecured Senior Note 1.94% [Member] | Mar. 31, 2014 NJR [Member] Debt Shelf Facility Metlife [Member] Unsecured Senior Note 2.51% [Member] | Mar. 31, 2014 NJR [Member] Debt Shelf Facility Prudential [Member] | Mar. 31, 2014 NJR [Member] Debt Shelf Facility Prudential [Member] Unsecured Senior Note 3.25% [Member] | Mar. 31, 2014 NJR [Member] Debt Shelf Facility Metlife 2 [Member] | Dec. 31, 2013 NJNG [Member] | Dec. 31, 2012 NJNG [Member] | Mar. 31, 2014 NJNG [Member] First Mortgage [Member] Series QQ [Member] | Mar. 31, 2014 NJNG [Member] First Mortgage [Member] Series HH [Member] | Mar. 31, 2014 NJNG [Member] First Mortgage [Member] Series RR [Member] | Mar. 31, 2014 NJNG [Member] Unsecured Debt [Member] | Mar. 14, 2014 NJNG [Member] Unsecured Debt [Member] | Apr. 10, 2014 Long-term Debt [Member] NJNG [Member] First Mortgage [Member] Series HH [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 100,000,000 |  |  | $ 75,000,000 |  | $ 100,000,000 |  |  |  |  |  |  |  |
Line of credit facility, issuance period |  |  | 2 years |  |  |  | 3 years |  | 3 years |  |  |  |  |  |  |  |
Amount issued and outstanding |  |  |  |  | 25,000,000 | 25,000,000 |  | 50,000,000 |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  | 1.94% | 2.51% |  | 3.25% |  |  |  | 3.58% | 5.00% | 4.61% |  | 4.77% |
Repayments of First Mortgage Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000
Repayments of Long-term Debt | 65,017,000 | 3,833,000 |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  |  | 70,000,000 |  | 55,000,000 |  |  |
Sale leaseback transaction, gross proceeds |  |  |  |  |  |  |  |  |  | $ 7,600,000 | $ 7,100,000 |  |  |  |  |  |

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- Definition Line of Credit Facility, Issuance period + 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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- Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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 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 The cash inflow from amounts received from a long-term debt instrument secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow from the repayment of a long-term debt instrument issued, secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease back to the seller. + 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 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 Reference 3: 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 + Details
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