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DEBT - NJR AND NJNG LONG-TERM DEBT (Details) - USD ($) $ in Millions | Nov. 07, 2024 | Sep. 30, 2024 | Jun. 26, 2024 | Sep. 28, 2023
--- | --- | --- | --- | ---
NJNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
NJBPU dividend restriction, equity to capitalization ratio |  | 53.40% |  |
Minimum | NJNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
NJBPU dividend restriction, equity to capitalization ratio |  | 30.00% |  |
First Mortgage Bonds | NJNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum amount that can be issued |  | $ 1,400.0 |  |
Senior Notes | NJNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  | $ 200.0 | $ 100.0
Senior Notes | Unsecured Senior Notes 5.56% | NJNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  |  | $ 50.0
Stated interest rate |  |  |  | 5.56%
Senior Notes | Unsecured Senior Notes 5.58% | NJNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  |  | $ 50.0
Stated interest rate |  |  |  | 5.85%
Senior Notes | Unsecured Senior Notes 5.82% | NJNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  | $ 125.0 |
Stated interest rate |  |  | 5.82% |
Senior Notes | Unsecured Senior Notes 5.49% | NJNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  | $ 75.0 |
Stated interest rate |  |  | 5.49% |
Senior Notes | Subsequent Event | Unsecured Senior Notes 5.55% | NJR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount | $ 100.0 |  |  |
Stated interest rate | 5.55% |  |  |

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