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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Numerator    
Net income $ 72,402 $ 93,559
Denominator    
Weighted average shares outstanding — basic (shares) 60,096 60,810
Dilutive effect of common shares from stock options and restricted stock units 291 1,072
Weighted average shares outstanding — diluted (shares) 60,387 61,882
Basic net income per share (dollars per share) $ 1.20 $ 1.54
Diluted net income per share (dollars per share) $ 1.20 $ 1.51