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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SOFTWARE COSTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Capitalized software costs | $ 5,714 |  | $ 5,714 |  | $ 5,582
Software amortization | 113 | $ 111 | 225 | $ 188 |
Operation and maintenance |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 2,828 | 2,847 | 5,351 | 4,770 |
Depreciation and amortization |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 303 | $ 270 | 602 | $ 523 |
Utility plant, at cost |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 16,959 |  | 16,959 |  | 16,543
Construction work in progress | Regulated |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 20,752 |  | 20,752 |  | 7,801
Construction work in progress | Unregulated |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 0 |  | 0 |  | 8
Nonutility plant and equipment, at cost |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 344 |  | 344 |  | 338
Accumulated depreciation and amortization, utility plant |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Accumulated depreciation and amortization | (1,944) |  | (1,944) |  | (1,333)
Accumulated depreciation and amortization, nonutility plant and equipment |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Accumulated depreciation and amortization | $ (19) |  | $ (19) |  | $ (29)

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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 http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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