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DERIVATIVE INSTRUMENTS - VOLUME (Details) - Bcf	6 Months Ended	12 Months Ended
DERIVATIVE INSTRUMENTS - VOLUME (Details) - Bcf	Mar. 31, 2023	Sep. 30, 2022
Natural Gas Distribution \| Long \| Futures
Derivative [Line Items]
Notional amount	32.2	30.5
Natural Gas Distribution \| Long \| Physical Commodity
Derivative [Line Items]
Notional amount	8.8	6.8
Energy Services \| Long \| Physical Commodity
Derivative [Line Items]
Notional amount	(0.2)	2.7
Energy Services \| Short \| Futures
Derivative [Line Items]
Notional amount	(5.6)	(0.7)