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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SOFTWARE COSTS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |
Capitalized software costs | $ 6,649 |  | $ 6,120
Software amortization | 114 | $ 113 |
Operation and maintenance |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |
Software costs | 3,753 | 2,523 |
Depreciation and amortization |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |
Software costs | 871 | $ 299 |
Utility plant, at cost |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |
Software costs | 46,066 |  | 40,437
Construction work in progress | Regulated |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |
Software costs | 22,619 |  | 14,381
Nonutility plant and equipment, at cost |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |
Software costs | 344 |  | 344
Accumulated depreciation and amortization, utility plant |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |
Accumulated depreciation and amortization | (4,229) |  | (3,361)
Accumulated depreciation and amortization, nonutility plant and equipment |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |
Accumulated depreciation and amortization | $ (28) |  | $ (25)

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