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DEBT - SCHEDULE OF LONG TERM DEBT (Details) (USD $) | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
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Jun. 30, 2013 NJNG [Member] | Sep. 30, 2012 NJNG [Member] | Jun. 30, 2013 NJNG [Member] Bank Revolving Credit Facility [Member] | Sep. 30, 2012 NJNG [Member] Bank Revolving Credit Facility [Member] | Jun. 30, 2013 NJR [Member] Bank Revolving Credit Facility [Member] | Sep. 30, 2012 NJR [Member] Bank Revolving Credit Facility [Member] | Mar. 31, 2013 NJR [Member] Debt Shelf Facility Metlife [Member] | Jun. 30, 2013 Debt Shelf Facility Prudential [Member] NJR [Member] | Jun. 30, 2013 Unsecured senior note 1.94% [Member] Debt Shelf Facility Metlife [Member] NJR [Member] | Jun. 30, 2013 Unsecured senior note 2.51% [Member] Debt Shelf Facility Metlife [Member] NJR [Member] | Jun. 30, 2013 Unsecured senior note 3.25% [Member] Debt Shelf Facility Prudential [Member] NJR [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  | $ 154,000,000 |  | $ 65,000,000 |  | $ 107,710,000 | [1] | $ 166,339,000 | [1] |  | $ 25,000,000 |  |  |
Sale leaseback transaction, gross proceeds | 7,100,000 | 6,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | 250,000,000 | [2] | 200,000,000 | [2] | 325,000,000 | [2] | 325,000,000 | [2] | 100,000,000 | 75,000,000 |  |  |
Amount issued and outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 | 25,000,000 | 50,000,000
Proceeds from issuance of long-term debt | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage | 3.15% |  |  |  |  |  |  |  |  |  |  |  | 1.94% | 2.51% | 3.25%
[1] | Letters of credit outstanding total $16.4 million and $13.9 million as of June 30, 2013 and September 30, 2012, respectively, which reduces amount available.
[2] | Committed credit facilities, which require commitment fees on the unused amounts.

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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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + 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 52 -URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51843-112757 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=9155692&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 51 -URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51840-112757 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 98 -Section Appendix A -Paragraph 28, 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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