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INCOME TAXES (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Income Tax Contingency [Line Items] |  |  |
Forecasted effective tax rate, percentage | 23.10% | 21.70% |
Actual effective tax rate, percentage | 22.60% | 21.40% |
ITC carryforward | $ 192.0 |  | $ 191.6
Effective term | 20 years |  |
Operating loss carryforward, valuation allowance | $ 0.5 |  | 0.6
State |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | $ 453.8 |  | $ 634.7
State | Minimum |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective term | 7 years |  |
State | Maximum |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective term | 20 years |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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