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Consolidated Statements of Comprehensive Income Statement - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Statement of Comprehensive Income [Abstract]      
Net income $ 394,948 $ 322,160 $ 331,241
Other comprehensive income (loss):      
Foreign currency translation adjustment 1,477 (4,502) (68)
Available-for-sale securities:      
Unrealized gains (losses) on available-for-sale securities, net of taxes of $286, $(160), and $(234) for the years ended September 30, 2023, 2022, and 2021, respectively 2,090 (1,449) (1,557)
Reclassification adjustment for realized (losses) gains included in net income, net of taxes of $78, $48, and $(69) for the years ended September 30, 2023, 2022, and 2021, respectively (612) (152) 268
Net change in unrealized gains (losses) on available-for-sale securities, net of tax 1,478 (1,601) (1,289)
Total other comprehensive income (loss) 2,955 (6,103) (1,357)
Comprehensive income $ 397,903 $ 316,057 $ 329,884