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DEBT, SCHEDULE OF LONG TERM DEBT (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2014 First Mortgage [Member] | Sep. 30, 2012 Debt, Auction Rate Securities [Member] | Sep. 30, 2014 NJNG [Member] | Sep. 30, 2013 NJNG [Member] | Sep. 30, 2012 NJNG [Member] | Sep. 30, 2014 NJNG [Member] Unsecured Debt [Member] | Sep. 30, 2013 NJNG [Member] Unsecured Debt [Member] | Sep. 30, 2014 NJNG [Member] Variable Demand Rate Notes [Member] | Sep. 30, 2014 NJNG [Member] Variable Demand Rate Notes [Member] Base Rate [Member] | Sep. 30, 2014 NJNG [Member] Variable Demand Rate Notes [Member] LIBOR [Member] | Sep. 30, 2014 NJNG [Member] Series HH [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series HH [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Series II [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series II [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Series JJ [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series JJ [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Series KK [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series KK [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Series LL [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series LL [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Series MM [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series MM [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Series NN [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series NN [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Series OO [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series OO [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Series PP [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series PP [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Series, QQ [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series, QQ [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Series, RR [Member] First Mortgage [Member] | Sep. 30, 2013 NJNG [Member] Series, RR [Member] First Mortgage [Member] | Sep. 30, 2014 NJNG [Member] Capital lease obligation-Buildings [Member] Capital Lease Obligations [Member] | Sep. 30, 2013 NJNG [Member] Capital lease obligation-Buildings [Member] Capital Lease Obligations [Member] | Sep. 30, 2014 NJNG [Member] Capital lease obligation-Meters [Member] Capital Lease Obligations [Member] | Sep. 30, 2013 NJNG [Member] Capital lease obligation-Meters [Member] Capital Lease Obligations [Member] | Sep. 30, 2014 NJNG [Member] Capital lease obligation-Equipment [Member] Capital Lease Obligations [Member] | Sep. 30, 2013 NJNG [Member] Capital lease obligation-Equipment [Member] Capital Lease Obligations [Member] | Sep. 30, 2014 NJNG [Member] Private Placement [Member] First Mortgage [Member] | Sep. 30, 2014 NJR [Member] | Sep. 30, 2013 NJR [Member] | Sep. 30, 2014 NJR [Member] Unsecured Debt [Member] | Sep. 30, 2014 NJR [Member] Unsecured senior notes 6.05% [Member] | Sep. 30, 2013 NJR [Member] Unsecured senior notes 6.05% [Member] | Sep. 30, 2014 NJR [Member] Unsecured senior note 1.94% [Member] | Sep. 30, 2013 NJR [Member] Unsecured senior note 1.94% [Member] | Sep. 30, 2014 NJR [Member] Unsecured senior note 2.51% [Member] | Sep. 30, 2013 NJR [Member] Unsecured senior note 2.51% [Member] | Sep. 30, 2014 NJR [Member] Unsecured senior note 3.25% [Member] | Sep. 30, 2013 NJR [Member] Unsecured senior note 3.25% [Member] | Sep. 30, 2014 NJR [Member] Unsecured senior note 3.48% [Member] | Sep. 30, 2014 NJR [Member] Debt Shelf Facility Prudential [Member] | Jun. 30, 2014 NJR [Member] Debt Shelf Facility Prudential [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 75,000,000
Long-term debt |  |  |  |  |  |  |  |  | 0 | 60,000,000 |  |  |  | 0 | 12,000,000 | 10,300,000 | 10,300,000 | 10,500,000 | 10,500,000 | 15,000,000 | 15,000,000 | 125,000,000 | 125,000,000 | 9,545,000 | 9,545,000 | 41,000,000 | 41,000,000 | 46,500,000 | 46,500,000 | 50,000,000 | 50,000,000 | 70,000,000 | 0 | 55,000,000 | 0 | 18,726,000 | 20,381,000 | 31,143,000 | 31,261,000 | 0 | 42,000 |  |  |  |  | 50,000,000 | 50,000,000 | 25,000,000 | 25,000,000 | 25,000,000 | 25,000,000 | 50,000,000 | 50,000,000 | 100,000,000 |  |
Less: Current maturities of long-term debt |  |  |  |  |  | (9,505,000) | (68,643,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (25,000,000) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 598,209,000 | 512,886,000 |  |  |  | 473,209,000 | 362,886,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 4.77% |  |  |  |  | 5.00% |  | 4.50% |  | 4.60% |  | 4.90% |  | 5.60% |  |  |  |  |  |  |  | 3.15% |  | 3.58% |  | 4.61% |  |  |  |  |  |  |  | 4.77% |  |  | 6.05% |  |  | 1.94% |  | 2.51% |  | 3.25% |  | 3.48% |  |
Interest rate term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Variable |  | Variable |  | Variable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter |  |  |  |  |  | 307,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
NJBPU dividend restriction, equity to capitalization ratio | 0.30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to equity ratio | 0.509 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused Borrowing Capacity |  |  |  | 841,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term debt | 125,000,000 | 50,000,000 | 100,000,000 |  | 97,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest accrual period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 0.55% | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum daily rate |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on EDA Bonds |  |  |  |  |  |  |  |  |  |  | 0.66% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of long-term debt | 82,586,000 | 8,953,000 | 8,025,000 |  |  | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of first mortgage bonds | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale leaseback transaction, lease term |  |  |  |  |  | 25 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale leaseback transaction, lease renewal term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale leaseback transaction, maximum lease renewal term |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale-leaseback transaction | 7,576,000 | 7,076,000 | 6,522,000 |  |  | 7,600,000 | 7,100,000 | 6,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale leaseback transaction, other payments required |  |  |  |  |  | 956,000 | 752,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Present Value of Future Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subtotal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Less: interest component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,100,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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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 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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