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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Numerator        
Net income $ 189,912 $ 144,079 $ 501,887 $ 401,482
Denominator        
Weighted average shares outstanding — basic (shares) 57,772 58,584 57,989 58,832
Dilutive effect of common shares from stock options and restricted stock units 720 563 784 629
Weighted average shares outstanding — diluted (shares) 58,492 59,147 58,773 59,461
Basic net income per share (dollars per share) $ 3.29 $ 2.46 $ 8.65 $ 6.82
Diluted net income per share (dollars per share) $ 3.25 $ 2.44 $ 8.54 $ 6.75