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Consolidated Statements of Comprehensive Income Statement - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]      
Net income $ 566,778 $ 394,948 $ 322,160
Other comprehensive income (loss):      
Foreign currency translation adjustment 2,227 1,477 (4,502)
Available-for-sale securities:      
Unrealized gains (losses) on securities, net of taxes of $18, $286, and $(160) for the years ended September 30, 2024, 2023, and 2022, respectively 82 2,090 (1,449)
Reclassification adjustment for realized losses included in net income, net of taxes of $0, $78, and $48 for the years ended September 30, 2024, 2023, and 2022, respectively 0 (612) (152)
Net change in unrealized gains (losses) on available-for-sale securities, net of tax 82 1,478 (1,601)
Total other comprehensive income (loss) 2,309 2,955 (6,103)
Comprehensive income $ 569,087 $ 397,903 $ 316,057