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DEBT - CREDIT FACILITIES AND SHORT-TERM DEBT (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2023 | Feb. 07, 2023 | Sep. 30, 2022
NJR | Letter of Credit on Behalf of NJRES |  |  |
Line of Credit Facility [Line Items] |  |  |
Letters of credit outstanding, amount | $ 5,200,000 |  | $ 9,700,000
NJNG | Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Letters of credit outstanding, amount | $ 731,000 |  | 731,000
Revolving Credit Facility | NJR |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fee percentage | 0.10% |  |
Revolving Credit Facility | NJNG |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fee percentage | 0.075% |  |
Revolving Credit Facility | Committed Credit Facilities Due September 2027 | NJR |  |  |
Line of Credit Facility [Line Items] |  |  |
Bank revolving credit facilities | $ 650,000,000 |  | 650,000,000
Amount outstanding at end of period | $ 134,525,000 |  | $ 200,150,000
Weighted average interest rate at end of period | 6.31% |  | 3.97%
Amount available at end of period | $ 510,302,000 |  | $ 440,177,000
Revolving Credit Facility | Committed Credit Facilities Due September 2027 | NJNG |  |  |
Line of Credit Facility [Line Items] |  |  |
Bank revolving credit facilities | 250,000,000 |  | 250,000,000
Amount outstanding at end of period | $ 10,700,000 |  | $ 73,800,000
Weighted average interest rate at end of period | 5.25% |  | 3.34%
Amount available at end of period | $ 238,569,000 |  | $ 175,469,000
Term Loan | Committed Credit Facilities Due February 2023 | NJR |  |  |
Line of Credit Facility [Line Items] |  |  |
Bank revolving credit facilities | 0 | $ 150,000,000 | 150,000,000
Amount outstanding at end of period | $ 0 |  | $ 150,000,000
Weighted average interest rate at end of period | 0.00% |  | 3.81%
Amount available at end of period | $ 0 |  | $ 0

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + 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 -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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