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DEBT - LONG TERM DEBT (Details) - USD ($) |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 16, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 23, 2022 | May 27, 2022 | Oct. 28, 2021
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from sale leaseback transactions |  | $ 17,300,000 | $ 0 |  |  |
Proceeds from sale leaseback transactions - solar |  | 3,300,000 | 17,673,000 |  |  |
Clean Energy Ventures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from sale leaseback transactions - solar |  | $ 3,300,000 | 17,700,000 |  |  |
Clean Energy Ventures | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Sale leaseback transaction lease term |  | 5 years |  |  |  |
Clean Energy Ventures | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Sale leaseback transaction lease term |  | 15 years |  |  |  |
NJNG |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from sale leaseback transactions |  | $ 17,300,000 | 0 |  |  |
Payments for sale leaseback transaction |  | $ 1,100,000 | $ 1,200,000 |  |  |
Senior Notes | NJR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount | $ 50,000,000 |  |  | $ 110,000,000 |  |
Debt instrument, term | 12 years |  |  |  |  |
Stated interest rate | 3.64% |  |  |  |  |
Senior Notes | NJR | Fixed Interest Rate Maturing 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  | 4.38% |  |
Senior Notes | NJNG |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  | $ 100,000,000 | $ 100,000,000
Senior Notes | NJNG | Fixed Interest Rate Maturing 2051 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 50,000,000
Stated interest rate |  |  |  |  |  | 2.97%
Senior Notes | NJNG | Fixed Interest Rate Maturing 2061 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 50,000,000
Stated interest rate |  |  |  |  |  | 3.07%
Senior Notes | NJNG | Fixed Interest Rate Maturing 2037 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  | $ 50,000,000 |
Stated interest rate |  |  |  |  | 4.37% |
Senior Notes | NJNG | Fixed Interest Rate Maturing 2052 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  | $ 50,000,000 |
Stated interest rate |  |  |  |  | 4.71% |

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