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INCOME TAXES (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020
Operating Loss Carryforwards [Line Items] |  |  |
Deferred employer portion of OASDI | $ 5,100 |  | $ 3,100
Forecasted effective tax rate | 19.90% | 19.40% |
Revaluation of deferred tax assets and liabilities | $ (145) | $ 2,700 |
Actual effective tax rate | 19.70% | 18.00% |
Deferred tax assets, operating loss carryforwards, domestic, refundable and receivables | $ 22,800 |  | 22,800
Deferred tax assets, operating loss carryforwards, domestic | 24,100 |  |
ITC carryforward | $ 193,200 |  | 195,200
Effective term | 20 years |  |
Valuation allowance | $ 17,600 |  | 17,600
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 134,000 |  | 134,000
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 442,400 |  | $ 487,700
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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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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