SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURAL GAS IN STORAGE (Details) $ in Thousands	Mar. 31, 2023 USD ($) Bcf	Sep. 30, 2022 USD ($) Bcf
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 84,916	$ 273,644
Natural Gas in Storage, Bcf | Bcf	18,300,000	39,800,000
Natural Gas Distribution
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 44,308	$ 191,175
Natural Gas in Storage, Bcf | Bcf	6,300,000	29,000,000.0
Energy Services
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 40,608	$ 82,469
Natural Gas in Storage, Bcf | Bcf	12,000,000.0	10,800,000