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Consolidated Statements of Comprehensive Income Statement - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]      
Net income $ 322,160 $ 331,241 $ 307,441
Other comprehensive (loss) income:      
Foreign currency translation adjustment (4,502) (68) (572)
Available-for-sale securities:      
Unrealized (losses) gains on securities, net of taxes of $(160), $(234), and $76 for the years ended September 30, 2022, 2021, and 2020, respectively (1,449) (1,557) 809
Reclassification adjustment for realized (losses) gains included in net income, net of taxes of $48, $(69), and $(65) for the years ended September 30, 2022, 2021, and 2020, respectively (152) 268 237
Net change in unrealized (losses) gains on available-for-sale securities, net of tax (1,601) (1,289) 1,046
Total other comprehensive (loss) income (6,103) (1,357) 474
Comprehensive income $ 316,057 $ 329,884 $ 307,915