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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, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Income Tax Disclosure [Abstract] |  |  |  |
Provision at statutory rate |  |  | $ 27,182 | $ 26,690
Tax-exempt income |  |  | (291) | (319)
State income taxes |  |  | 4,921 | 4,773
Interim period effective rate adjustment |  |  | (1,991) | (4,375)
Tax credit investments, net - federal |  |  | (7,161) | (3,694)
Research tax credit |  |  | (1,303) | 0
162(m) disallowance |  |  | 865 | 605
Other, net |  |  | (858) | (1,509)
Income tax expense | $ 14,171 | $ 16,166 | $ 21,364 | $ 22,171
Effective tax rate |  |  | 16.50% | 17.40%

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