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DERIVATIVE INSTRUMENTS - BROKER MARGIN DEPOSITS (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
NJNG | Assets, Current
Derivative [Line Items]
Broker margin - current assets	$ 6,161	$ 5,915
ES | Assets, Current
Derivative [Line Items]
Broker margin - current assets	13,170	14,881
ES | Liabilities, Current
Derivative [Line Items]
Broker margin - Current liabilities	$ 12,419	$ 8,029

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

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