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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income Tax Disclosure [Abstract] |  |  |  |
Provision at statutory rate |  |  | $ 36,547 | $ 37,887
Tax-exempt income |  |  | (480) | (522)
State income taxes |  |  | 6,562 | 7,300
Interim period effective rate adjustment |  |  | (9,971) | (846)
Tax credit investments, net - federal |  |  | (3,913) | (12,556)
Research tax credit |  |  | (752) | (602)
IRC 162(m) nondeductible compensation |  |  | 1,061 | 826
Other, net |  |  | (2,088) | (761)
Income tax expense | $ 4,795 | $ 6,103 | $ 26,966 | $ 30,726
Effective tax rate |  |  | 15.44% | 16.96%

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