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DEBT - NJR LONG-TERM DEBT (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 01, 2020 | May 14, 2020 | Aug. 15, 2019 | Jul. 17, 2019 | Jan. 26, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale leaseback transaction - solar | $ 42,927 | $ 0 | $ 71,538 |  |  |  |  |
Clean Energy Ventures |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale leaseback transaction - solar | $ 42,900 |  | $ 71,500 |  |  |  |  |
Interest rate swap | Credit Agreement Due August 16, 2019 | Unsecured senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 100,000
Fixed treasury rate |  |  |  |  |  |  |  | 2.84%
NJR | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Note purchase agreement amount |  |  |  | $ 200,000 | $ 260,000 |  |  |
NJR | Unsecured senior notes 3.29% | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Note purchase agreement amount |  |  |  |  |  |  | $ 150,000 |
Stated interest rate |  |  |  |  |  |  | 3.29% |
Long-term debt |  |  |  |  |  | $ 100,000 | $ 50,000 |
NJR | Fixed Interest Rate Maturing 2030 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Note purchase agreement amount |  |  |  |  | $ 130,000 |  |  |
Stated interest rate |  |  |  |  | 3.50% |  |  |
NJR | Fixed Interest Rate Maturing 2032 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Note purchase agreement amount |  |  |  |  | $ 130,000 |  |  |
Stated interest rate |  |  |  |  | 3.60% |  |  |
NJR | Unsecured senior note 3.13% | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate | 3.13% |  |  | 3.13% |  |  |  |
Long-term debt | $ 120,000 |  |  | $ 120,000 |  |  |  |
NJR | Unsecured senior notes 3.25% | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate | 3.25% |  |  | 3.25% |  |  |  |
Long-term debt | $ 80,000 |  |  | $ 80,000 |  |  |  |
Minimum | Clean Energy Ventures |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term of lease | 5 years |  |  |  |  |  |  |
Maximum | Clean Energy Ventures |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term of lease | 15 years |  |  |  |  |  |  |

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