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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Income Tax Disclosure [Abstract]        
Provision at statutory rate     $ 27,182 $ 26,690
Tax-exempt income     (291) (319)
State income taxes     4,921 4,773
Interim period effective rate adjustment     (1,991) (4,375)
Tax credit investments, net - federal     (7,161) (3,694)
Research tax credit     (1,303) 0
162(m) disallowance     865 605
Other, net     (858) (1,509)
Income tax expense $ 14,171 $ 16,166 $ 21,364 $ 22,171
Effective tax rate     16.50% 17.40%