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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SOFTWARE COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Capitalized software costs $ 6,980   $ 6,980   $ 6,120
Software amortization 148 $ 113 261 $ 225  
Operation and maintenance          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Software costs 3,886 2,828 7,638 5,351  
Depreciation and amortization          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Software costs 957 $ 303 1,828 $ 602  
Utility plant, at cost          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Software costs 48,950   48,950   40,437
Construction work in progress | Regulated          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Software costs 29,404   29,404   14,381
Nonutility plant and equipment, at cost          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Software costs 344   344   344
Accumulated depreciation and amortization, utility plant          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Accumulated depreciation and amortization (5,184)   (5,184)   (3,361)
Accumulated depreciation and amortization, nonutility plant and equipment          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Accumulated depreciation and amortization $ (30)   $ (30)   $ (25)