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INCOME TAXES (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | May 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit), solar investment tax credit, net of deferred taxes |  |  |  |  |  |  | $ (6,000,000)
Federal statutory income tax rate, percent |  |  |  |  |  | 24.50% |
Tax Cuts And Jobs Act Of 2017, income tax benefit |  | $ 844,000 |  | $ (57,700,000) |  |  |
Income tax provision (benefit) | $ (1,941,000) | $ (28,534,000) | $ (11,854,000) | $ (47,801,000) |  |  |
Forecasted effective tax rate |  |  | (4.60%) | 14.30% |  |  |
Forecasted tax credits, net of deferred tax |  |  |  |  |  | $ 22,000,000 |
Other reconciling Items, amount |  |  | $ 5,400,000 | $ 76,600,000 |  |  |
Other reconciling Items, percent |  |  | (8.50%) | (23.70%) |  |  |
Deferred tax assets, operating loss carryforwards, domestic, refundable and receivables | 23,000,000 |  | $ 23,000,000 |  |  | 23,000,000 |
Deferred tax assets, operating loss carryforwards, domestic | 24,500,000 |  | 24,500,000 |  |  |  |
ITC carryforward | 140,800,000 |  | 140,800,000 |  |  | 121,100,000 |
Valuation allowance | 4,000,000 |  | 4,000,000 |  |  | 4,000,000 |
Deferred income taxes |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Income tax provision (benefit) |  |  |  | $ (16,100,000) |  |  |
Public utilities, remeasurement of deferred income tax, liability |  |  |  |  |  | 14,300,000 |
Public utilities, amortization of excess deferred income taxes, liability |  |  |  |  |  | 890,000 |
Public utilities, revaluation of deferred income taxes not included in base rates, liability |  |  |  |  |  | 880,000 |
Federal |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards | 135,600,000 |  | 135,600,000 |  |  | 136,800,000 |
State |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards | $ 403,700,000 |  | $ 403,700,000 |  |  | $ 578,800,000 |
Scenario, Forecast |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Federal statutory income tax rate, percent |  |  |  |  | 21.00% |  |
Forecasted tax credits, net of deferred tax |  |  |  |  | $ 46,300,000 |  |

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