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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SOFTWARE COSTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Capitalized software costs | $ 10,522 | $ 8,375
Operation and maintenance |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Software costs | 13,087 | 14,299
Depreciation and amortization |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Software costs | 6,164 | 4,130
Utility plant, at cost |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Software costs | 133,158 | 51,282
Construction work in progress | Utility |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Software costs | 26,659 | 55,012
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 | (13,632) | (7,480)
Accumulated depreciation and amortization, nonutility plant and equipment |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Accumulated depreciation and amortization | $ (48) | $ (36)

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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details
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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-1 + Details
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