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DERIVATIVE INSTRUMENTS - BROKER MARGIN DEPOSITS (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Natural Gas Distribution | Assets, Current |  |
Derivative [Line Items] |  |
Broker margin - Current assets | $ 5,358 | $ 2,790
Energy Services | Assets, Current |  |
Derivative [Line Items] |  |
Broker margin - Current assets | 37,358 | 70,050
Energy Services | Liabilities, Current |  |
Derivative [Line Items] |  |
Broker margin - Current assets | $ (15,475) | $ 0

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