SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURAL GAS IN STORAGE (Details) $ in Thousands	Dec. 31, 2022 USD ($) Bcf	Sep. 30, 2022 USD ($) Bcf
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 254,360	$ 273,644
Natural Gas in Storage, Bcf | Bcf	40,100,000	39,800,000
Natural Gas Distribution
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 152,010	$ 191,175
Natural Gas in Storage, Bcf | Bcf	22,000,000.0	29,000,000.0
Energy Services
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 102,350	$ 82,469
Natural Gas in Storage, Bcf | Bcf	18,100,000	10,800,000