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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Federal statutory income tax rate, percent |  |  |  |  | 24.50%
Tax Cuts And Jobs Act Of 2017, income tax benefit | $ (967) |  | $ (58,500) |  |
Forecasted effective tax rate |  | (5.80%) | 17.20% |  |
Forecasted tax credits, net of deferred tax |  |  |  |  | $ 23,200
Excess tax benefits associated with vesting of share-based awards |  | $ 1,300 | $ 2,800 |  |
Actual effective tax rate since tax effects of awards are treated as discrete item |  | (6.60%) | (7.90%) |  |
Deferred tax assets, operating loss carryforwards, domestic, refundable and receivables |  | $ 23,000 |  |  | 23,000
Deferred tax assets, operating loss carryforwards, domestic |  | 24,500 |  |  |
ITC carryforward |  | 109,900 |  |  | 121,100
Valuation allowance |  | 4,000 |  |  | 4,000
Federal |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | 136,800 |  |  | 136,800
State |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | $ 385,400 |  |  | $ 578,800
Scenario, Forecast |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Federal statutory income tax rate, percent |  |  |  | 21.00% |
Forecasted tax credits, net of deferred tax |  |  |  | $ 45,200 |

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