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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Fair Value    
Derivative assets, current $ 7,688 $ 6,813
Derivative liability, current 8,162 6,271
Derivative assets, noncurrent 5,843 806
Derivative liabilities, noncurrent 4,618 11,490
Not Designated as Hedging Instrument    
Fair Value    
Derivative assets 13,531 7,619
Derivative liabilities 12,780 17,761
NJNG | Not Designated as Hedging Instrument | Physical commodity contracts    
Fair Value    
Derivative assets, current 118 21
Derivative liability, current 7 579
NJNG | Not Designated as Hedging Instrument | Financial commodity contracts    
Fair Value    
Derivative assets, current 153 0
Derivative liability, current 16 2
ES | Not Designated as Hedging Instrument | Physical commodity contracts    
Fair Value    
Derivative assets, current 2,015 1,660
Derivative liability, current 6,101 4,346
Derivative assets, noncurrent 4,716 727
Derivative liabilities, noncurrent 3,956 10,758
ES | Not Designated as Hedging Instrument | Financial commodity contracts    
Fair Value    
Derivative assets, current 5,402 5,132
Derivative liability, current 2,038 1,344
Derivative assets, noncurrent 1,127 79
Derivative liabilities, noncurrent $ 662 $ 732