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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Statement of Comprehensive Income [Abstract]        
Net income before noncontrolling interest $ 50,102 $ 59,909 $ 111,408 $ 89,167
Other comprehensive income (loss):        
Change in net unrealized gain (loss) on debt securities (93,632) (9,923) (102,774) (7,077)
Net (gain) realized on investment securities (260) (6) (397) (6)
Total (93,892) (9,929) (103,171) (7,083)
Unrealized gain on currency translation 143 126 209 571
Deferred income tax effect (23,651) (2,493) (25,989) (1,779)
Total other comprehensive (loss) (70,098) (7,310) (76,973) (4,733)
Total comprehensive income (loss) (19,996) 52,599 34,435 84,434
Total comprehensive income attributable to noncontrolling interest 851 843 833 2,064
Comprehensive income (loss) attributable to parent $ (20,847) $ 51,756 $ 33,602 $ 82,370