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DEBT - LONG TERM DEBT (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jul. 23, 2020 | May 14, 2020 | Apr. 29, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale-leaseback transaction |  |  |  |  | $ 9,895,000 |  |  |
Proceeds from sale-leaseback transaction - solar | $ 42,900,000 |  |  | $ 42,927,000 | 0 |  |  |
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 transaction |  | $ 4,000,000 | $ 9,900,000 |  |  |  |  |
Final principal payments for early purchase options |  |  |  | $ 1,200,000 | $ 1,100,000 |  |  |
NJNG | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt issued |  |  |  |  |  |  | $ 125,000,000 |
NJNG | Fixed Interest Rate Maturing 2050 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt issued | $ 50,000,000 |  |  | $ 50,000,000 |  |  | $ 100,000,000 |
Debt instrument interest rate | 3.13% |  |  | 3.13% |  |  | 3.13% |
NJNG | Fixed Interest Rate Maturing 2060 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt issued |  |  |  |  |  |  | $ 25,000,000 |
Debt instrument interest rate |  |  |  |  |  |  | 3.33% |
NJR | Treasury Lock |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  | $ 2,500,000
NJR | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt issued |  |  |  |  |  |  | $ 260,000,000 |
NJR | Fixed Interest Rate Maturing 2030 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt issued |  |  |  |  |  |  | $ 130,000,000 |
Debt instrument interest rate |  |  |  |  |  |  | 3.50% |
NJR | Fixed Interest Rate Maturing 2032 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt issued |  |  |  |  |  |  | $ 130,000,000 |
Debt instrument interest rate |  |  |  |  |  |  | 3.60% |
Subsequent Event | NJNG | Fixed Interest Rate Maturing 2050 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt issued |  |  |  |  |  | $ 50,000,000 |  |
Debt instrument interest rate |  |  |  |  |  | 3.13% |  |
Subsequent Event | NJNG | Fixed Interest Rate Maturing 2060 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt issued |  |  |  |  |  | $ 25,000,000 |  |
Debt instrument interest rate |  |  |  |  |  | 3.33% |  |

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