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DEBT, CREDIT FACILITIES (Details) (USD $) | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Commercial Paper [Member] NJNG [Member] | Sep. 30, 2012 Commercial Paper [Member] NJNG [Member] | Sep. 30, 2013 Letter of Credit [Member] NJR [Member] | Sep. 30, 2012 Letter of Credit [Member] NJR [Member] | Sep. 30, 2013 Letters of Credit on Behalf of NJRES [Member] NJR [Member] | Sep. 30, 2013 Letter of Credit on Behalf of NJNG [Member] NJNG [Member] | Sep. 30, 2012 Letter of Credit on Behalf of NJNG [Member] NJNG [Member] | Sep. 30, 2013 Letter of Credit on Behalf of NJRCEV [Member] NJR [Member] | Sep. 30, 2013 Debt Shelf Facility MetLife [Member] NJR [Member] | Sep. 26, 2013 Debt Shelf Facility MetLife [Member] NJR [Member] | Sep. 30, 2013 Debt Shelf Facility Prudential [Member] NJR [Member] | Sep. 30, 2013 Bank Credit Facilities Short term [Member] NJR [Member] | Sep. 30, 2012 Bank Credit Facilities Short term [Member] NJR [Member] | Sep. 30, 2013 Bank Credit Facilities Short term [Member] NJNG [Member] | Sep. 30, 2012 Bank Credit Facilities Short term [Member] NJNG [Member] | Sep. 30, 2013 JPMC Term Loan [Member] NJR [Member] | Sep. 30, 2013 Bank Credit Facilities, EDA Bonds [Member] NJNG [Member] | Sep. 30, 2012 Bank Credit Facilities, EDA Bonds [Member] NJNG [Member] | Sep. 30, 2013 Unsecured senior note 3.25% [Member] NJR [Member] | Sep. 30, 2012 Unsecured senior note 3.25% [Member] NJR [Member] | Sep. 30, 2013 Unsecured senior note 1.94% [Member] NJR [Member] | Sep. 30, 2012 Unsecured senior note 1.94% [Member] NJR [Member] | Sep. 30, 2013 Unsecured senior note 2.51% [Member] NJR [Member] | Sep. 30, 2012 Unsecured senior note 2.51% [Member] NJR [Member]
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Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 10,000,000 |  |  |  |  |  | $ 100,000,000 | $ 100,000,000 | $ 75,000,000 | $ 325,000,000 | $ 325,000,000 | $ 250,000,000 | $ 200,000,000 |  | $ 100,000,000 | $ 100,000,000 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 | 50,000,000 | 25,000,000 | 25,000,000 | 25,000,000 | 25,000,000
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  | 1.94% |  | 2.51% |
Line of credit facility, maximum borrowing capacity, incremental increase |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  | 15,000,000 |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity, maximum increase |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  | 50,000,000 |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  | 17,900,000 | 13,900,000 | 14,500,000 | 300,000 | 0 | 3,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt | 365,600,000 | 279,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  | 168,600,000 | 135,000,000 |  |  |  |  |  |  |  |  |  | 97,000,000 | 144,800,000 |  |  | 100,000,000 |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 0.13% | 0.18% |  |  |  |  |  |  |  |  |  | 1.00% | 1.16% |  |  | 0.74% |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 81,400,000 | $ 65,000,000 |  |  |  |  |  |  |  |  |  | $ 210,110,000 | $ 166,339,000 |  |  | $ 0 |  |  |  |  |  |  |  |

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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 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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