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DEBT, FIRST MORTGAGE BONDS (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2015 USD ($) debt_instrument | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |
NJBPU dividend restriction, equity to capitalization ratio | 0.30 |  |
Debt to equity ratio | 0.542 |  |
Payment of long-term debt | $ 37,039 | $ 82,586 | $ 8,953
Variable Rate Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Number of debt instruments issued | debt_instrument | 3 |  |
Long-term debt | $ 97,000 |  |
Series HH [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayment of first mortgage bonds |  | 12,000 |
First Mortgage Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum amount that can be issued | 830,700 |  |
NJNG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Payment of long-term debt |  | 60,000 |
NJNG [Member] | First Mortgage Bonds [Member] | Series PP [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 50,000 | 50,000 |
Stated interest rate | 3.15% |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series, QQ [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 70,000 | 70,000 |
Stated interest rate | 3.58% |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series, RR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 55,000 | $ 55,000 |
Stated interest rate | 4.61% |  |
NJNG [Member] | First Mortgage Bonds [Member] | Private Placement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.77% |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series HH [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 5.00% |
NJNG [Member] | First Mortgage Bonds [Member] | Series, SS [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 50,000 | $ 0 |
Stated interest rate | 2.82% |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series, TT [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 100,000 | $ 0 |
Stated interest rate | 3.66% |  |
NJNG [Member] | Variable Demand Rate Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest accrual period | 5 years |  |
Maximum daily rate | 12.00% |  |
Interest rate on EDA Bonds | 0.69% |  |
NJNG [Member] | Variable Demand Rate Notes [Member] | Base Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.55% |  |
NJNG [Member] | Variable Demand Rate Notes [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 70.00% |  |

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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 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 Reference 2: 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 + Details
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