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DEBT, SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) | Sep. 30, 2016 | Jun. 21, 2016 | Mar. 22, 2016 | Sep. 30, 2015 | Apr. 15, 2015 | Nov. 07, 2014 | Mar. 13, 2014 | Apr. 15, 2013
--- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total long-term debt | $ 1,063,550,000 |  |  | $ 843,595,000 |  |  |  |
NJNG |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Less: Current maturities of long-term debt | (11,452,000) |  |  | (11,138,000) |  |  |  |
Total long-term debt | 738,550,000 |  |  | 618,595,000 |  |  |  |
NJNG | First mortgage bonds: | Series II |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 10,300,000 |  |  | 10,300,000 |  |  |  |
Stated interest rate | 4.50% |  |  |  |  |  |  |
NJNG | First mortgage bonds: | Series JJ |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 10,500,000 |  |  | 10,500,000 |  |  |  |
Stated interest rate | 4.60% |  |  |  |  |  |  |
NJNG | First mortgage bonds: | Series KK |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 15,000,000 |  |  | 15,000,000 |  |  |  |
Stated interest rate | 4.90% |  |  |  |  |  |  |
NJNG | First mortgage bonds: | Series LL |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 125,000,000 |  |  | 125,000,000 |  |  |  |
Stated interest rate | 5.60% |  |  |  |  |  |  |
NJNG | First mortgage bonds: | Series MM |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 9,545,000 |  |  | 9,545,000 |  |  |  |
NJNG | First mortgage bonds: | Series NN |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | 41,000,000 |  |  | 41,000,000 |  |  |  |
NJNG | First mortgage bonds: | Series OO |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | 46,500,000 |  |  | 46,500,000 |  |  |  |
NJNG | First mortgage bonds: | Series PP |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 50,000,000 |  |  | 50,000,000 |  |  |  |
Stated interest rate | 3.15% |  |  |  |  |  |  | 3.15%
NJNG | First mortgage bonds: | Series QQ |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 70,000,000 |  |  | 70,000,000 |  |  |  |
Stated interest rate | 3.58% |  |  |  |  |  | 3.58% |
NJNG | First mortgage bonds: | Series RR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 55,000,000 |  |  | 55,000,000 |  |  |  |
Stated interest rate | 4.61% |  |  |  |  |  | 4.61% |
NJNG | First mortgage bonds: | Series SS |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 50,000,000 |  |  | 50,000,000 |  |  |  |
Stated interest rate | 2.82% |  |  |  | 2.82% |  |  |
NJNG | First mortgage bonds: | Series TT |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 100,000,000 |  |  | 100,000,000 |  |  |  |
Stated interest rate | 3.66% |  |  |  | 3.66% |  |  |
NJNG | Series UU 3.63% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 125,000,000 |  |  | 0 |  |  |  |
Stated interest rate | 3.63% | 3.63% |  |  |  |  |  |
NJNG | Capital lease obligations | Capital lease obligation-buildings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 14,262,000 |  |  | 16,700,000 |  |  |  |
NJNG | Capital lease obligations | Capital lease obligation-meters |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | 27,895,000 |  |  | 30,188,000 |  |  |  |
NJR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Less: Current maturities of long-term debt | (50,000,000) |  |  | 0 |  |  |  |
Total long-term debt | 325,000,000 |  |  | 225,000,000 |  |  |  |
NJR | Unsecured senior notes 6.05% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 50,000,000 |  |  | 50,000,000 |  |  |  |
Stated interest rate | 6.05% |  |  |  |  |  |  |
NJR | Unsecured senior notes 2.51% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 25,000,000 |  |  | 25,000,000 |  |  |  |
Stated interest rate | 2.51% |  |  |  |  |  |  |
NJR | Unsecured senior notes 3.25% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 50,000,000 |  |  | 50,000,000 |  |  |  |
Stated interest rate | 3.25% |  |  |  |  |  |  |
NJR | Unsecured senior notes 3.48% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 100,000,000 |  |  | 100,000,000 |  | $ 100,000,000 |  |
Stated interest rate | 3.48% |  |  |  |  | 3.48% |  |
NJR | Unsecured senior notes 3.20% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 50,000,000 |  |  | 0 |  |  |  |
Stated interest rate | 3.20% |  | 3.20% |  |  |  |  |
NJR | Unsecured senior notes 3.54% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 100,000,000 |  |  | $ 0 |  |  |  |
Stated interest rate | 3.54% |  | 3.54% |  |  |  |  |

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