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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 88,976 $ 83,019 $ 242,814 $ 232,814
Other comprehensive income (loss):        
Foreign currency translation adjustment 884 (1,910) 2,868 (2,506)
Available-for-sale securities:        
Unrealized gains (losses) on securities, net of taxes of $30 and $42 for the three months ended June 30, 2023 and 2022, respectively, and $262 and $(180) for the nine months ended June 30, 2023 and 2022, respectively 157 20 1,984 (1,895)
Reclassification adjustment for realized losses included in net income, net of taxes of $0 and $34 for the three months ended June 30, 2023 and 2022, respectively, and $78 and $48 for the nine months ended June 30, 2023 and 2022, respectively 0 (108) (612) (152)
Net change in unrealized gains (losses) on available-for-sale securities, net of tax 157 (88) 1,372 (2,047)
Total other comprehensive income (loss) 1,041 (1,998) 4,240 (4,553)
Comprehensive income $ 90,017 $ 81,021 $ 247,054 $ 228,261