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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SOFTWARE COSTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2022
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Capitalized software costs | $ 7,625 |  | $ 7,625 |  | $ 6,120
Software amortization | 125 | $ 113 | 387 | $ 339 |
Operation and maintenance |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 3,163 | 2,835 | 10,801 | 8,186 |
Depreciation and amortization |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 1,320 | $ 637 | 3,148 | $ 1,239 |
Utility plant, at cost |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 50,911 |  | 50,911 |  | 40,437
Construction work in progress | Regulated |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 41,533 |  | 41,533 |  | 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 | (6,501) |  | (6,501) |  | (3,361)
Accumulated depreciation and amortization, nonutility plant and equipment |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Accumulated depreciation and amortization | $ (33) |  | $ (33) |  | $ (25)

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- Definition For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-1 + Details
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