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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ (7,534) | $ 36,947 | $ 23,992 | $ 87,926
ES | Physical commodity contracts | Operating revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Nonutility | Nonutility | Nonutility | Nonutility
Amount of gain (loss) recognized in income on derivatives | $ (3,651) | $ 7,208 | $ 10,379 | $ 17,246
ES | Physical commodity contracts | Natural gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gas purchases - Utility and Nonutility | Gas purchases - Utility and Nonutility | Gas purchases - Utility and Nonutility | Gas purchases - Utility and Nonutility
Amount of gain (loss) recognized in income on derivatives | $ (1,424) | $ (124) | $ (2,010) | $ (794)
ES | Financial commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (2,459) | 29,863 | 15,623 | 71,474
NJNG |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (7,062) | (38,497) | (3,800) | (98,191)
NJNG | Physical commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (3,920) | (203) | (4,990) | (28,234)
NJNG | Financial commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ (3,142) | $ (38,294) | $ 1,190 | $ (69,957)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + 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/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E + Details
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