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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Numerator        
Net income $ 56,236 $ 43,241 $ 149,795 $ 130,919
Denominator        
Weighted average shares outstanding — basic (shares) 60,573 60,667 60,693 61,058
Dilutive effect of common shares from stock options and restricted stock units 832 1,491 968 1,234
Weighted average shares outstanding — diluted (shares) 61,405 62,158 61,661 62,292
Basic net income per share (dollars per share) $ 0.93 $ 0.71 $ 2.47 $ 2.14
Diluted net income per share (dollars per share) $ 0.92 $ 0.70 $ 2.43 $ 2.10