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DEBT - NJR SHORT-TERM DEBT (Details) | Apr. 24, 2020 USD ($) | Oct. 09, 2019 USD ($) | Dec. 05, 2018 USD ($) | Dec. 05, 2018 USD ($) Mutual_option | Dec. 05, 2018 USD ($) lease | Oct. 24, 2020 USD ($) | Sep. 30, 2020 USD ($) debt_instrument | Dec. 13, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 25, 2018 USD ($)
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Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  | $ 125,350,000 |  | $ 25,450,000 |
Bridge Loan |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Note purchase agreement amount |  | $ 350,000,000 |  |  |  |  |  |  |  |
Bridge Loan | Debt Instrument, Interest Rate, First 180 Days |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.875% |  |  |  |  |  |  |  |
Bridge Loan | Debt Instrument, Interest Rate, After 180 Days |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.075% |  |  |  |  |  |  |  |
NJR | Letters of Credit on Behalf of NJRES |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Number of debt instruments (in debt instruments) | debt_instrument |  |  |  |  |  |  | 7 |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  | $ 10,300,000 |  | 4,800,000 |
NJR | Bank revolving credit facilities |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, term | 364 days |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 250,000,000 |  | $ 425,000,000 | $ 425,000,000 | $ 425,000,000 |  |  |  |  | $ 425,000,000
Number of mutual options |  |  |  | 2 | 2 |  |  |  |  |
Number of mutual options, extension period |  |  | 1 year |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity, incremental increase |  |  | $ 50,000,000 | $ 50,000,000 | $ 50,000,000 |  |  |  |  |
Line of credit facility, maximum borrowing capacity, maximum increase |  |  | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 |  |  |  |  |
NJR | Bank revolving credit facilities | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.625% |  |  |  |  |  |  |  |  |
NJR | Credit Facilities Due April 2021 | Bank revolving credit facilities |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 250,000,000 | $ 150,000,000 | $ 0 |
NJR | Credit Facilities Due April 2021 | Bank revolving credit facilities | Subsequent Event |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 0 |  |  |  |

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