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Summary Of Significant Accounting Policies - Schedule Of Computation Of Basic And Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Accounting Policies [Abstract]      
Net income $ 566,778 $ 394,948 $ 322,160
Weighted average shares outstanding - basic 58,720 59,909 60,274
Dilutive effect of common shares from stock options and restricted stock units 639 361 823
Weighted average shares outstanding - diluted 59,359 60,270 61,097
Basic net income per share (USD per share) $ 9.65 $ 6.59 $ 5.34
Diluted net income per share (USD per share) $ 9.55 $ 6.55 $ 5.27