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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

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