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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]        
Net income before noncontrolling interest $ 59,909 $ 53,608 $ 89,167 $ 75,857
Other comprehensive income (loss):        
Change in net unrealized (loss) on debt securities (9,923) (2,079) (7,077) (5,492)
Net (gain) realized on investment securities (6) 0 (6) 0
Total (9,929) (2,079) (7,083) (5,492)
Unrealized gain (loss) on currency translation 126 (680) 571 (564)
Deferred income tax effect (2,493) (518) (1,779) (1,371)
Total other comprehensive (loss) (7,310) (2,241) (4,733) (4,685)
Total comprehensive income 52,599 51,367 84,434 71,172
Total comprehensive income attributable to noncontrolling interest 843 1,304 2,064 2,485
Comprehensive income attributable to parent $ 51,756 $ 50,063 $ 82,370 $ 68,687