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FAIR VALUE - DEBT (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Finance leases | $ 30,290 | $ 20,100
NJNG |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Finance leases | 30,290 |
Debt issuance costs | 9,528 | 9,093
NJR |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt issuance costs | 3,800 | 3,300
Level 2 | NJNG | Carrying value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, fair value | 1,292,845 | 1,092,845
Level 2 | NJNG | Fair market value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, fair value | 979,388 | 1,188,261
Level 2 | NJR | Carrying value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, fair value | 1,070,000 | 1,010,000
Level 2 | NJR | Fair market value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, fair value | $ 966,968 | $ 1,100,283

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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