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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, 2025
Sep. 30, 2024
Sep. 30, 2023
Accounting Policies [Abstract]      
Net income $ 692,380 $ 566,778 $ 394,948
Weighted average shares outstanding - basic 57,904 58,720 59,909
Dilutive effect of common shares from stock options and restricted stock units 780 639 361
Weighted average shares outstanding - diluted 58,684 59,359 60,270
Basic net income per share (USD per share) $ 11.96 $ 9.65 $ 6.59
Diluted net income per share (USD per share) $ 11.80 $ 9.55 $ 6.55