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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Tax Disclosure [Abstract]        
Provision at statutory rate     $ 30,808 $ 34,063
Tax-exempt income     (600) (541)
State income taxes     6,109 6,728
Interim period effective rate adjustment     (3,065) (2,849)
Tax credit investments, net - federal     (13,669) (6,994)
Research tax credit     (805) (355)
IRC 162(m) nondeductible compensation     928 801
Other, net     (710) (1,617)
Income tax expense $ 3,243 $ 6,958 $ 18,996 $ 29,236
Effective tax rate     12.80% 17.77%