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DEBT - CREDIT FACILITIES NARRATIVE (Details) - USD ($) | Apr. 24, 2020 | Mar. 31, 2021 | Oct. 24, 2020 | Sep. 30, 2020 | Dec. 13, 2019
--- | --- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |
Short-term debt |  | $ 8,500,000 |  | $ 125,350,000 |
NJR | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, term | 364 days |  |  |  |
Bank revolving credit facilities, maximum borrowing capacity | $ 250,000,000 |  |  |  |
NJR | Revolving Credit Facility | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.625% |  |  |  |
NJR | Revolving Credit Facility | Credit Facilities Due April 2021 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Bank revolving credit facilities, maximum borrowing capacity |  | $ 0 |  | $ 250,000,000 | $ 150,000,000
Short-term debt |  |  | $ 0 |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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