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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Statement of Comprehensive Income [Abstract]        
Net income before noncontrolling interest $ 55,368 $ 50,102 $ 83,790 $ 111,408
Other comprehensive income (loss):        
Change in net unrealized gain (loss) on debt securities 18,530 (93,632) 33,238 (102,774)
Net loss (gain) realized on investment securities (82) (260) (82) (397)
Total 18,448 (93,892) 33,156 (103,171)
Unrealized gain (loss) on currency translation 60 143 447 209
Deferred income tax effect 4,647 (23,651) 8,352 (25,989)
Total other comprehensive income (loss) 13,861 (70,098) 25,251 (76,973)
Total comprehensive income (loss) 69,229 (19,996) 109,041 34,435
Total comprehensive income attributable to noncontrolling interest 597 851 1,177 833
Comprehensive income (loss) attributable to parent $ 68,632 $ (20,847) $ 107,864 $ 33,602