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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Income Tax Disclosure [Abstract] |  |  |  |
Provision at statutory rate |  |  | $ 23,917 | $ 20,657
Tax-exempt income |  |  | (341) | (398)
State income taxes |  |  | 4,550 | 4,285
Interim period effective rate adjustment |  |  | 4,581 | (483)
Tax credit investments, net - federal |  |  | (11,363) | (7,916)
Research tax credit |  |  | 0 | (805)
IRC 162(m) nondeductible compensation |  |  | 340 | 576
Other, net |  |  | (719) | (163)
Income tax expense | $ 15,246 | $ 9,176 | $ 20,965 | $ 15,753
Effective tax rate |  |  | 18.33% | 15.83%

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