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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in income on derivatives $ (14,816) $ (1,645) $ 13,667 $ 22,347
ES | Physical commodity contracts | Operating revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Nonutility Nonutility Nonutility Nonutility
Amount of gain (loss) recognized in income on derivatives $ (24,938) $ 3,560 $ 8,510 $ 13,939
ES | Physical commodity contracts | Natural gas purchases        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gas purchases - Utility and Nonutility Gas purchases - Utility and Nonutility Gas purchases - Utility and Nonutility Gas purchases - Utility and Nonutility
Amount of gain (loss) recognized in income on derivatives $ (158) $ 210 $ (1,185) $ (1,800)
ES | Physical commodity contracts | Operation and maintenance        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in income on derivatives 1,356 0 230 0
ES | Financial commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in income on derivatives 8,924 (5,415) 6,112 10,208
NJNG        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in income on derivatives (20,135) 7,626 (2,732) 3,826
NJNG | Physical commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in income on derivatives 1,166 188 (17,408) (4,802)
NJNG | Financial commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in income on derivatives $ (21,301) $ 7,438 $ 14,676 $ 8,628