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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)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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