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DEBT, SCHEDULE OF LONG TERM DEBT (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 512,886,000 | $ 525,169,000 |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |
Proceeds from long-term debt | 50,000,000 | 100,000,000 | 97,045,000
NJR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | 150,000,000 | 150,000,000 |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |
2014 | 0 |  |
2015 | 25,000,000 |  |
2016 | 0 |  |
2017 | 50,000,000 |  |
2018 | 25,000,000 |  |
Thereafter | 50,000,000 |  |
Present Value of Future Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract] |  |  |
2014 | 11,300,000 |  |
2015 | 10,700,000 |  |
2016 | 10,900,000 |  |
2017 | 9,800,000 |  |
2018 | 7,900,000 |  |
Thereafter | 11,300,000 |  |
Subtotal | 61,900,000 |  |
Less: interest component | (10,200,000) |  |
Total | 51,700,000 |  |
NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Less: Current maturities of long-term debt | (68,643,000) | (7,760,000) |
Total long-term debt | 362,886,000 | 375,169,000 |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |
2014 | 60,000,000 |  |
2015 | 0 |  |
2016 | 0 |  |
2017 | 0 |  |
2018 | 125,000,000 |  |
Thereafter | 194,800,000 |  |
Sale leaseback transaction, gross proceeds | 7,100,000 | 6,500,000 | 5,900,000
Sale leaseback transaction, other payments required | 800,000 | 1,000,000 | 3,900,000
First Mortgage [Member] |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |
Amount of restricted net assets for consolidated and unconsolidated subsidiaries | 510,900,000 |  |
Retained earnings, appropriated | 339,800,000 |  |
Variable Demand Rate Notes [Member] | NJNG [Member] |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum | 12.00% |  |
Debt Instrument, Interest Rate, Effective Percentage | 0.09% |  |
Unsecured Debt [Member] | NJR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 50,000,000 | 50,000,000 |
Stated interest rate | 6.05% |  |
Unsecured Debt [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 60,000,000 | 60,000,000 |
Stated interest rate | 4.77% |  |
Unsecured senior note 1.94% [Member] | NJR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 25,000,000 | 25,000,000 |
Stated interest rate | 1.94% |  |
Unsecured senior note 2.51% [Member] | NJR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 25,000,000 | 25,000,000 |
Stated interest rate | 2.51% |  |
Unsecured senior note 3.25% [Member] | NJR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 50,000,000 | 50,000,000 |
Stated interest rate | 3.25% |  |
Debt, Auction Rate Securities [Member] |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |
Proceeds from long-term debt |  |  | 97,000,000
Series HH [Member] | First Mortgage [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 12,000,000 | 12,000,000 |
Stated interest rate | 5.00% |  |
Series II [Member] | First Mortgage [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 10,300,000 | 10,300,000 |
Stated interest rate | 4.50% |  |
Series JJ [Member] | First Mortgage [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 10,500,000 | 10,500,000 |
Stated interest rate | 4.60% |  |
Series KK [Member] | First Mortgage [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 15,000,000 | 15,000,000 |
Stated interest rate | 4.90% |  |
Series LL [Member] | First Mortgage [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 125,000,000 | 125,000,000 |
Stated interest rate | 5.60% |  |
Series MM [Member] | First Mortgage [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 9,545,000 | 9,545,000 |
Interest rate term | Variable |  |
Series NN [Member] | First Mortgage [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 41,000,000 | 41,000,000 |
Interest rate term | Variable |  |
Series OO [Member] | First Mortgage [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 46,500,000 | 46,500,000 |
Interest rate term | Variable |  |
Series PP [Member] | First Mortgage [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 50,000,000 | 0 |
Stated interest rate | 3.15% |  |
Capital lease obligation-Buildings [Member] | Capital Lease Obligations [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 20,381,000 | 21,907,000 |
Capital lease obligation-Meters [Member] | Capital Lease Obligations [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 31,261,000 | 30,887,000 |
Capital lease obligation-Equipment [Member] | Capital Lease Obligations [Member] | NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 42,000 | $ 290,000 |

X
- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Subparagraph 3 -Article 4 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + 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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