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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Tax Disclosure [Abstract]        
Provision at statutory rate     $ 20,041 $ 15,449
Tax-exempt income     (936) (2,360)
State income taxes     4,475 3,243
Interim period effective rate adjustment     (8,850) 1,397
Tax credit investments, net - federal     (9,863) (22,484)
Research tax credit     (1,709) 0
IRC 162(m) nondeductible compensation     1,250 1,612
Other, net     (538) (101)
Income tax expense (benefit) $ (2,426) $ (1,158) $ 3,870 $ (3,244)
Effective tax rate     3.91% (4.20%)