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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Numerator    
Net income $ 138,382 $ 72,402
Denominator    
Weighted average shares outstanding — basic (shares) 59,122 60,096
Dilutive effect of common shares from stock options and restricted stock units 531 291
Weighted average shares outstanding — diluted (shares) 59,653 60,387
Basic net income per share (dollars per share) $ 2.34 $ 1.20
Diluted net income per share (dollars per share) $ 2.32 $ 1.20