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DEBT - CREDIT FACILITIES (Details) (USD $) | Dec. 31, 2012 | Sep. 30, 2012
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Commercial Paper [Member] | NJNG [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount outstanding at end of period | $ 204,800,000 |  | $ 135,000,000 |
Weighted average interest rate at end of period | 0.19% |  | 0.18% |
Debt Shelf Facilities Long term [Member] | NJR [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount outstanding at end of period | 100,000,000 |  | 100,000,000 |
Weighted average interest rate at end of period | 2.74% |  | 2.74% |
Notes Payable to Banks [Member] | NJR [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount outstanding at end of period | 189,600,000 |  | 144,800,000 |
Weighted average interest rate at end of period | 1.11% |  | 1.16% |
Letter of Credit [Member] | NJR [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit outstanding, amount | 18,900,000 |  | 13,900,000 |
Bank Credit Facilities, EDA Bonds [Member] | NJNG [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Bank credit facilities | 100,000,000 | [1],[2] | 100,000,000 | [1],[2]
Bank Credit Facilities Short term [Member] | NJNG [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Bank credit facilities | 250,000,000 | [2] | 200,000,000 | [2]
Amount available at end of period | 45,200,000 |  | 65,000,000 |
Bank Credit Facilities Short term [Member] | NJR [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Bank credit facilities | 325,000,000 | [2] | 325,000,000 | [2]
Amount available at end of period | 116,510,000 | [3] | 166,339,000 | [3]
Debt Shelf Facilities Long term [Member] | NJR [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Bank credit facilities | 175,000,000 | [4],[5] | 175,000,000 | [4],[5]
Amount available at end of period | 75,000,000 |  | 75,000,000 |
Debt Shelf Facility MetLife [Member] | NJR [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Bank credit facilities | 100,000,000 |  | 100,000,000 |
Debt Shelf Facility Prudential [Member] | NJR [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Bank credit facilities | $ 75,000,000 |  | $ 75,000,000 |
[1] | There were no borrowings outstanding as of December 31, 2012 and September 30, 2012, respectively.
[2] | Committed credit facilities, which require commitment fees on the unused amounts.
[3] | Letters of credit outstanding total $18.9 million and $13.9 million as of December 31, 2012 and September 30, 2012, respectively, which reduces amount available.
[4] | $100 million debt shelf expires May 2013 and $75 million debt shelf expires June 2014.
[5] | Uncommitted, long-term debt shelf facilities, which require no 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: 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 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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