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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net income $ 93,559 $ 87,678
Other comprehensive (loss) income:    
Foreign currency translation adjustment (517) 1,278
Available-for-sale securities:    
Unrealized losses on securities, net of taxes of $(74) and $(50) for the three months ended December 31, 2021 and 2020, respectively (621) (420)
Reclassification adjustment for realized (losses) gains included in net income, net of taxes of $2 and $0 for the three months ended December 31, 2021 and 2020, respectively (4) 3
Net change in unrealized losses on available-for-sale securities, net of tax (625) (417)
Total other comprehensive (loss) income (1,142) 861
Comprehensive income $ 92,417 $ 88,539