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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Tax Disclosure [Abstract]        
Provision at statutory rate     $ 34,063 $ 28,435
Tax-exempt income     (541) (674)
State income taxes     6,728 6,120
Interim period effective rate adjustment     (2,849) (5,181)
Tax credit investments, net - federal     (6,994) (18,854)
Research tax credit     (355) (323)
IRC 162(m) nondeductible compensation     801 677
Other, net     (1,617) (600)
Income tax expense $ 6,958 $ 4,934 $ 29,236 $ 9,600
Effective tax rate     17.77% 6.92%