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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023
Fair Value
Derivative assets, current	$ 4,771	$ 30,755
Derivative liability, current	7,632	16,145
Derivative assets, noncurrent	979	1,564
Derivative liabilities, noncurrent	11,962	7,967
Not Designated as Hedging Instrument
Fair Value
Derivative assets	5,750	32,319
Derivative liabilities	19,594	24,112
NJNG | Not Designated as Hedging Instrument | Physical commodity contracts
Fair Value
Derivative assets, current	81	43
Derivative liability, current	1	488
NJNG | Not Designated as Hedging Instrument | Financial commodity contracts
Fair Value
Derivative assets, current	0	6,110
Derivative liability, current	60	20
ES | Not Designated as Hedging Instrument | Physical commodity contracts
Fair Value
Derivative assets, current	1,636	6,209
Derivative liability, current	6,197	12,757
Derivative assets, noncurrent	816	802
Derivative liabilities, noncurrent	11,422	7,870
ES | Not Designated as Hedging Instrument | Financial commodity contracts
Fair Value
Derivative assets, current	3,054	18,393
Derivative liability, current	1,374	2,880
Derivative assets, noncurrent	163	762
Derivative liabilities, noncurrent	$ 540	$ 97

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