DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Fair Value
Derivative assets, current	$ 32,127	$ 24,635
Derivative liability, current	17,563	49,848
Derivative assets, noncurrent	1,864	6,385
Derivative liabilities, noncurrent	13,257	14,191
Not Designated as Hedging Instrument
Fair Value
Derivative assets	33,991	31,020
Derivative liabilities	30,820	64,039
Natural Gas Distribution | Not Designated as Hedging Instrument | Physical commodity contracts
Fair Value
Derivative assets, current	61	252
Derivative liability, current	5	11
Natural Gas Distribution | Not Designated as Hedging Instrument | Financial commodity contracts
Fair Value
Derivative assets, current	6,714	85
Derivative liability, current	188	6,281
Energy Services | Not Designated as Hedging Instrument | Physical commodity contracts
Fair Value
Derivative assets, current	6,547	9,857
Derivative liability, current	13,079	17,051
Derivative assets, noncurrent	679	376
Derivative liabilities, noncurrent	13,136	13,561
Energy Services | Not Designated as Hedging Instrument | Financial commodity contracts
Fair Value
Derivative assets, current	18,805	14,423
Derivative liability, current	4,291	26,488
Derivative assets, noncurrent	1,185	6,009
Derivative liabilities, noncurrent	121	630
Energy Services | Not Designated as Hedging Instrument | Foreign currency contracts
Fair Value
Derivative assets, current	0	18
Derivative liability, current	$ 0	$ 17