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DEBT - NJR LONG-TERM DEBT (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 18, 2017 USD ($) | Sep. 30, 2017 USD ($) asset | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Mar. 22, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from sale-leaseback transaction - solar |  |  | $ 32,901,000 | $ 0 | $ 0 |
Credit Agreement Due August 16, 2019 | Term loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 100,000,000 | $ 100,000,000 | 100,000,000 |  |  |
NJR | Unsecured senior notes 3.25% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 50,000,000 | $ 50,000,000 | 50,000,000 |  |
Stated interest rate |  | 3.25% | 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 2.51% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 25,000,000 | $ 25,000,000 | 25,000,000 |  |
Stated interest rate |  | 2.51% | 2.51% |  |  |
NJR | Unsecured senior notes 3.20% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 50,000,000 | $ 50,000,000 | 50,000,000 |  |
Stated interest rate |  | 3.20% | 3.20% |  |  | 3.20%
NJR | Unsecured senior notes 3.54% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 100,000,000 | $ 100,000,000 | 100,000,000 |  |
Stated interest rate |  | 3.54% | 3.54% |  |  | 3.54%
NJR | Variable Demand Rate Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, effective percentage |  | 1.95% | 1.95% |  |  |
NJR | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 0 | $ 0 | $ 0 |  |
Clean Energy Ventures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of commercial solar assets sold | asset |  | 2 |  |  |  |
Term of lease |  | 7 years |  |  |  |
Proceeds from sale-leaseback transaction - solar |  | $ 32,901,000 |  |  |  |
Annual rental payments (next 5 years) |  | $ 2,700,000 |  |  |  |
Annual contractual commitments, number of years |  | 5 years |  |  |  |
Annual contractual commitments, aggregate thereafter |  | $ 5,300,000 | $ 5,300,000 |  |  |
London Interbank Offered Rate (LIBOR) | Credit Agreement Due August 16, 2019 | Term loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 0.70% |  |  |  |  |

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