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INCOME TAXES (Details) - USD ($) | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2024 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2019 | May 31, 2019 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Income tax expense (benefit), solar investment tax credit, net of deferred taxes |  |  |  |  |  |  | $ (10,000,000) |
Unrecognized tax benefits | $ 4,900,000 | $ 0 |  |  |  |  |  |
Forecasted effective tax rate | 0.60% | (7.20%) |  |  |  |  |  |
Tax credit carryforwards expected, net | $ 39,700,000 |  |  |  |  | $ 47,700,000 |  |
Discrete adjustments, amount | $ 798,000 | $ 1,300,000 |  |  |  |  |  |
Effective income tax | (0.30%) | (8.80%) |  |  |  |  |  |
ITC carryforward | $ 158,700,000 |  |  |  |  | 154,200,000 |  |
Effective term | 20 years |  |  |  |  |  |  |
Deferred tax assets, operating loss carryforwards, domestic | $ 24,100,000 |  |  |  |  |  |  |
Deferred tax assets, operating loss carryforwards, domestic, refundable and receivables | 22,800,000 |  |  |  |  | 22,800,000 |  |
Valuation allowance | $ 4,000,000 |  |  |  |  | 4,000,000 |  |
Investment tax credit, solar property | 30.00% |  |  |  |  |  | 30.00% |
Scenario, Forecast |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Investment tax credit, solar property |  |  | 10.00% | 22.00% | 26.00% |  |  |
Federal |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards | $ 134,000,000 |  |  |  |  |  |  | $ 134,000,000
State |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards | $ 340,200,000 |  |  |  |  | $ 340,200,000 |  |
State | Minimum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Effective term | 7 years |  |  |  |  |  |  |
State | Maximum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Effective term | 20 years |  |  |  |  |  |  |

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