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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, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Numerator        
Net income $ 145,530 $ 119,021 $ 311,975 $ 257,403
Denominator        
Weighted average shares outstanding — basic (shares) 57,886 58,788 58,098 58,956
Dilutive effect of common shares from stock options and restricted stock units 878 792 815 661
Weighted average shares outstanding — diluted (shares) 58,764 59,580 58,913 59,617
Basic net income per share (dollars per share) $ 2.51 $ 2.02 $ 5.37 $ 4.37
Diluted net income per share (dollars per share) $ 2.48 $ 2.00 $ 5.30 $ 4.32