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INCOME TAXES - INCOME TAX RECONCILIATION (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Statutory income tax expense | $ 73,735 | $ 31,747 | $ 41,896
Change resulting from: |  |  |
Investment/production tax credits | (300) | (322) | (322)
Cost of removal of assets placed in service prior to 1981 | (3,533) | (5,366) | (5,362)
AFUDC equity | (2,361) | (786) | (4,933)
State income taxes, net of federal benefit | 13,072 | 6,124 | 11,965
NJ Unitary method change | 0 | 0 | (15,345)
Valuation allowance | (1,372) | 5,974 | 13,604
Tax Act - utility excess deferred income taxes amortized | (3,573) | (3,573) | (3,573)
Other | 527 | (512) | (1,436)
Income tax provision | $ 76,195 | $ 33,286 | $ 36,494
Effective income tax rate | 21.70% | 22.00% | 18.30%

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