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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Tax Disclosure [Abstract]        
Provision at statutory rate     $ 28,435 $ 20,041
Tax-exempt income     (674) (936)
State income taxes     6,120 4,475
Interim period effective rate adjustment     (5,181) (8,850)
Tax credit investments, net - federal     (18,854) (9,863)
Research tax credit     (323) (1,709)
IRC 162(m) nondeductible compensation     677 1,250
Other, net     (600) (538)
Income tax expense $ 4,934 $ (2,426) $ 9,600 $ 3,870
Effective tax rate     6.92% 3.91%