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DEBT - SCHEDULE OF LONG TERM DEBT (Details) (USD $) | 9 Months Ended | 0 Months Ended |  | 24 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 3 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 9 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Jul. 23, 2014 Subsequent Event [Member] | Jul. 23, 2014 NJR [Member] Unsecured senior note 3.48% [Member] Subsequent Event [Member] | May 10, 2013 NJR [Member] Debt Shelf Facility Metlife [Member] | Jun. 30, 2014 NJR [Member] Debt Shelf Facility Metlife [Member] Unsecured Senior Notes [Member] note | Jun. 30, 2014 NJR [Member] Debt Shelf Facility Metlife [Member] Unsecured Senior Note 1.94% [Member] | Jun. 30, 2014 NJR [Member] Debt Shelf Facility Metlife [Member] Unsecured Senior Note 2.51% [Member] | Jun. 30, 2014 NJR [Member] Debt Shelf Facility Prudential [Member] | Jun. 30, 2014 NJR [Member] Debt Shelf Facility Prudential [Member] Unsecured Senior Note 3.25% [Member] | Jun. 30, 2014 NJR [Member] Debt Shelf Facility Metlife 2 [Member] | Dec. 31, 2013 NJNG [Member] | Dec. 31, 2012 NJNG [Member] | Mar. 13, 2014 NJNG [Member] First Mortgage [Member] Series QQ [Member] | Jun. 30, 2014 NJNG [Member] First Mortgage [Member] Series QQ [Member] | Mar. 13, 2014 NJNG [Member] First Mortgage [Member] Series RR [Member] | Jun. 30, 2014 NJNG [Member] First Mortgage [Member] Series RR [Member] | May 27, 2014 NJNG [Member] First Mortgage [Member] Series HH [Member] | May 27, 2014 NJNG [Member] First Mortgage [Member] Series HH [Member] | Jun. 30, 2014 NJNG [Member] Unsecured Debt [Member] | Mar. 14, 2014 NJNG [Member] Unsecured Debt [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 |  |  |  |  |  |  |  |  |  |
Number of debt outstanding |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount issued and outstanding |  |  |  |  |  |  | 25,000,000 | 25,000,000 |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.48% |  |  | 1.94% | 2.51% |  | 3.25% |  |  |  |  | 3.58% |  | 4.61% |  | 5.00% |  | 4.77%
Line of credit facility, remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Senior Long-term Debt |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term | 3 years |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,000,000 |  | 55,000,000 |  |  |  |  |
Payments of long-term debt | 78,964,000 | 5,808,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |
Repayments of first mortgage bond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  |  |
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 Long-term Debt, Number of Debt Outstanding + 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 Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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 inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + 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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