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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Tax Disclosure [Abstract]        
Provision at statutory rate     $ 33,778 $ 30,808
Tax-exempt income     (522) (600)
State income taxes     6,518 6,109
Interim period effective rate adjustment     (593) (3,065)
Tax credit investments, net - federal     (12,556) (13,669)
Research tax credit     (602) (805)
IRC 162(m) nondeductible compensation     826 928
Other, net     (761) (710)
Income tax expense $ 5,123 $ 3,243 $ 26,088 $ 18,996
Effective tax rate     16.15% 12.80%