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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 $ 56,236 $ 43,241 $ 149,795 $ 130,919
Other comprehensive (loss) income:        
Foreign currency translation adjustment (79) (841) (596) 437
Available-for-sale securities:        
Unrealized losses on securities, net of taxes of $(148) and $(142) for the three months ended March 31, 2022 and 2021, respectively, and $(222) and $(192) for the six months ended March 31, 2022 and 2021, respectively (1,294) (731) (1,915) (1,151)
Reclassification adjustment for realized (losses) gains included in net income, net of taxes of $12 and $(61) for the three months ended March 31, 2022 and 2021, respectively, and $14 and $(61) for the six months ended March 31, 2022 and 2021, respectively (40) 233 (44) 236
Net change in unrealized losses on available-for-sale securities, net of tax (1,334) (498) (1,959) (915)
Total other comprehensive loss (1,413) (1,339) (2,555) (478)
Comprehensive income $ 54,823 $ 41,902 $ 147,240 $ 130,441