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STOCK-BASED COMPENSATION - STOCK-BASED COMPENSATION EXPENSE (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense included in operation and maintenance expense | $ 14,827 | $ 7,149 | $ 6,536
Income tax benefit | (3,624) | (1,613) | (1,900)
Total, net of tax | 11,203 | 5,536 | 4,636
Taxes related to stock-based compensation | (144) | (159) | 647
Performance share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense included in operation and maintenance expense | 4,131 | 3,856 | 1,943
Restricted and non-restricted stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense included in operation and maintenance expense | 3,189 | 3,193 | 2,868
Deferred retention stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense included in operation and maintenance expense | $ 7,507 | $ 100 | $ 1,725

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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