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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Numerator    
Net income $ 166,445 $ 138,382
Denominator    
Weighted average shares outstanding — basic (shares) 58,305 59,122
Dilutive effect of common shares from stock options and restricted stock units 753 531
Weighted average shares outstanding — diluted (shares) 59,058 59,653
Basic net income per share (dollars per share) $ 2.85 $ 2.34
Diluted net income per share (dollars per share) $ 2.82 $ 2.32