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DERIVATIVE INSTRUMENTS - VOLUME (Details) - Bcf	9 Months Ended	12 Months Ended
	Jun. 30, 2025	Sep. 30, 2024
NJNG | Long | Futures
Derivative [Line Items]
Notional amount	25.8	31.9
NJNG | Long | Physical Commodity
Derivative [Line Items]
Notional amount	3.7	10.9
ES | Short | Futures
Derivative [Line Items]
Notional amount	(5.5)	(7.7)
ES | Short | Physical Commodity
Derivative [Line Items]
Notional amount	(3.0)	2.8

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 815
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-Section 55
-Paragraph 181
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