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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]        
Net income $ 119,021 $ 81,436 $ 257,403 $ 153,838
Other comprehensive (loss) income:        
Foreign currency translation adjustment (386) (266) 2,118 1,984
Available-for-sale securities:        
Unrealized gains on securities, net of taxes of $4 and $118 for the three months ended March 31, 2024 and 2023, respectively, and $16 and $232 for the six months ended March 31, 2024 and 2023, respectively 20 1,060 69 1,827
Reclassification adjustment for realized losses included in net income, net of taxes of $0 and $58 for the three months ended March 31, 2024 and 2023, respectively, and $0 and $78 for the six months ended March 31, 2024 and 2023, respectively 0 (552) 0 (612)
Net change in unrealized gains and losses on available-for-sale securities, net of tax 20 508 69 1,215
Total other comprehensive (loss) income (366) 242 2,187 3,199
Comprehensive income $ 118,655 $ 81,678 $ 259,590 $ 157,037