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DEBT - FIRST MORTGAGE BONDS (Details) $ in Thousands | Aug. 01, 2019 USD ($) First_mortgage_bond | Apr. 18, 2019 USD ($) First_mortgage_bond | Sep. 30, 2020 USD ($) | Sep. 01, 2020 USD ($) | Jul. 23, 2020 USD ($) | Jun. 30, 2020 USD ($) | May 14, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jul. 17, 2019 USD ($)
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
NJBPU dividend restriction, equity to capitalization ratio |  |  | 0.30 |  |  |  |  |  |
Debt to equity ratio |  |  | 0.531 |  |  |  |  |  |
First mortgage bonds: |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount that can be issued |  |  | $ 1,100,000 |  |  |  |  |  |
NJNG |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Number of first mortgage bonds completed | First_mortgage_bond | 3 | 3 |  |  |  |  |  |  |
Proceeds from reissuance of first mortgage bond | $ 97,000 | $ 35,800 |  |  |  |  |  |  |
NJNG | First mortgage bonds: |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average interest rate |  | 3.02% |  |  |  |  |  |  |
NJNG | First mortgage bonds: | Series OO |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 46,500 |  |  |  |  | $ 46,500 |
Stated interest rate |  |  | 3.00% |  |  |  |  |  |
NJNG | First mortgage bonds: | Series CCC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 41,000 |  |  |  |  | 41,000 |
Stated interest rate |  |  | 3.00% |  |  |  |  |  |
NJNG | First mortgage bonds: | Series BBB |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 9,545 |  |  |  |  | $ 9,545 |
Stated interest rate |  |  | 2.75% |  |  |  |  |  |
NJNG | Unsecured Senior Note 3.76% |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 100,000
Stated interest rate |  |  |  |  |  |  |  |  | 3.76%
NJNG | Unsecured Senior Note 3.86% |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 85,000
Stated interest rate |  |  |  |  |  |  |  |  | 3.86%
NJNG | Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Note purchase agreement amount |  |  |  | $ 75,000 |  |  | $ 125,000 |  |
NJNG | Senior Notes | Fixed Interest Rate Maturing 2050 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.87% | 3.13% | 3.13% | 3.13% |  |
Note purchase agreement amount |  |  |  | $ 25,000 | $ 50,000 | $ 50,000 | $ 100,000 |  |
NJNG | Senior Notes | Fixed Interest Rate Maturing 2060 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.97% | 3.33% |  | 3.33% |  |
Note purchase agreement amount |  |  |  | $ 50,000 | $ 25,000 |  | $ 25,000 |  |

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