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STOCK-BASED COMPENSATION - STOCK-BASED COMPENSATION EXPENSE (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense included in operation and maintenance expense | $ 6,536 | $ 9,796 | $ 12,845
Income tax benefit | (1,900) | (2,848) | (3,734)
Total, net of tax | 4,636 | 6,948 | 9,111
Tax benefit of delivered shares from stock based compensation | 647 | 1,290 | 2,950
Performance share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense included in operation and maintenance expense | 1,943 | 5,804 | 3,526
Restricted and non-restricted stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense included in operation and maintenance expense | 2,868 | 2,492 | 2,191
Deferred retention stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense included in operation and maintenance expense | $ 1,725 | $ 1,500 | $ 7,128

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