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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SOFTWARE COSTS (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Capitalized software costs | $ 5,485,000 |  | $ 5,485,000 |  | $ 4,707,000
Software amortization | 111,000 | $ 0 | 188,000 | $ 0 |
Operation and maintenance |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 2,847,000 | 1,109,000 | 4,770,000 | 2,596,000 |
Depreciation and amortization |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 270,000 | $ 0 | 523,000 | $ 0 |
Utility plant, at cost |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 14,011,000 |  | 14,011,000 |  | 13,452,000
Nonutility plant and equipment, at cost |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 334,000 |  | 334,000 |  | 316,000
Accumulated depreciation and amortization, utility plant |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Accumulated depreciation and amortization | (790,000) |  | (790,000) |  | (279,000)
Accumulated depreciation and amortization, nonutility plant and equipment |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Accumulated depreciation and amortization | $ (17,000) |  | $ (17,000) |  | $ (5,000)

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