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Earnings per Share - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Numerator for basic and diluted earnings per share      
Net income $ 429,375 $ 373,541 $ 392,084
Denominator — share:      
Basic weighted-average shares (in shares) 24,986 26,042 28,734
Effect of dilutive securities (in shares) 381 305 526
Diluted weighted-average shares (in shares) 25,367 26,347 29,260
Diluted earnings per share (in dollars per share) $ 16.93 $ 14.18 $ 13.40
Basic earnings per share (in dollars per share) $ 17.18 $ 14.34 $ 13.65