DERIVATIVE INSTRUMENTS - BROKER MARGIN DEPOSITS (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Natural Gas Distribution | Assets, Current
Derivative [Line Items]
Broker margin - Current assets	$ 11,617	$ 2,790
Energy Services | Assets, Current
Derivative [Line Items]
Broker margin - Current assets	38,284	70,050
Energy Services | Liabilities, Current
Derivative [Line Items]
Broker margin - Current liabilities	$ (2,464)	$ 0