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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, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Numerator        
Net income $ 119,021 $ 81,436 $ 257,403 $ 153,838
Denominator        
Weighted average shares outstanding — basic (shares) 58,788 60,330 58,956 60,211
Dilutive effect of common shares from stock options and restricted stock units 792 361 661 326
Weighted average shares outstanding — diluted (shares) 59,580 60,691 59,617 60,537
Basic net income per share (dollars per share) $ 2.02 $ 1.35 $ 4.37 $ 2.55
Diluted net income per share (dollars per share) $ 2.00 $ 1.34 $ 4.32 $ 2.54