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DERIVATIVE INSTRUMENTS - BROKER MARGIN DEPOSITS (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
NJNG | Assets, Current |  |
Derivative [Line Items] |  |
Broker margin - current assets | $ 1,643 | $ 4,975
ES | Assets, Current |  |
Derivative [Line Items] |  |
Broker margin - current assets | 11,027 | 8,268
ES | Liabilities, Current |  |
Derivative [Line Items] |  |
Broker margin - current liabilities | $ 0 | $ 1,146

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