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Earnings per Share - Schedule of Calculation of Numerator and Denominator in Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Numerator:      
Net income $ 305.9 $ 260.8 $ 238.5
Less: Allocation to participating securities (10.4) (9.1) (8.1)
Net income allocated to common stockholders, basic 295.5 251.7 230.4
Net income allocated to common stockholders, diluted $ 295.5 $ 251.7 $ 230.4
Denominator:      
Common shares outstanding (in shares) 47,431,675 45,808,855 44,904,000
Dilutive potential common shares outstanding:      
Share-based awards (in shares) 2,692,827 1,628,688 1,489,516
Diluted shares outstanding (in shares) 50,124,502 47,437,543 46,393,516
Earnings per share:      
Earnings per share - basic (in dollar per share) $ 6.22 $ 5.49 $ 5.14
Earnings per share - diluted (in dollar per share) $ 5.89 $ 5.31 $ 4.97