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DERIVATIVE INSTRUMENTS - VOLUME (Details) - Bcf	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023
NJNG | Long | Futures
Derivative [Line Items]
Notional amount	17.7	32.1
NJNG | Long | Physical Commodity
Derivative [Line Items]
Notional amount	7.8	12.1
ES | Long | Physical Commodity
Derivative [Line Items]
Notional amount	(1.6)	0.2
ES | Short | Futures
Derivative [Line Items]
Notional amount	(10.0)	(6.9)

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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 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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- Definition

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+ References

No definition available.

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