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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 $ 81,436 $ 56,236 $ 153,838 $ 149,795
Other comprehensive income (loss):        
Foreign currency translation adjustment (266) (79) 1,984 (596)
Available-for-sale securities:        
Unrealized gains (losses) on securities, net of taxes of $118 and $(148) for the three months ended March 31, 2023 and 2022, respectively, and $232 and $(222) for the six months ended March 31, 2023 and 2022, respectively 1,060 (1,294) 1,827 (1,915)
Reclassification adjustment for realized losses included in net income, net of taxes of $58 and $12 for the three months ended March 31, 2023 and 2022, respectively, and $78 and $14 for the six months ended March 31, 2023 and 2022, respectively (552) (40) (612) (44)
Net change in unrealized gains (losses) on available-for-sale securities, net of tax 508 (1,334) 1,215 (1,959)
Total other comprehensive income (loss) 242 (1,413) 3,199 (2,555)
Comprehensive income $ 81,678 $ 54,823 $ 157,037 $ 147,240