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INCOME TAXES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |
Deferred employer portion of OASDI | $ 2,700 | $ 5,100 |
ITC carryforward | $ 211,800 | 224,200 |
Effective term | 20 years |  |
Potential net capital loss | $ 56,600 | 61,800 |
Valuation allowance | 22,241 | 23,613 |
Operating loss carryforward, valuation allowance | 17,200 | 17,300 |
Investment tax credit, solar property, percentage |  |  | 26.00%
Capital Loss Carryforward |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit carryforward, valuation allowance | 5,100 | 6,400 |
State and Local Jurisdiction |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | $ 544,400 | $ 554,600 |
State and Local Jurisdiction | Minimum |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective term | 7 years |  |
State and Local Jurisdiction | Maximum |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective term | 20 years |  |

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