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FAIR VALUE - DEBT (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Finance leases | $ 33,300 | $ 30,300
NJR |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt issuance costs | 3,800 | 3,800
NJNG |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt issuance costs | 9,700 | 9,500
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Finance leases | 22,200 | 15,700
Level 2 | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, fair value | 2,537,845 | 2,362,845
Level 2 | Fair market value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, fair value | $ 2,177,799 | $ 1,946,356

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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