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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income $ 203.4 $ 166.9 $ 178.8
Weighted average number of common shares 50,426,040 49,986,526 49,818,132
Dilutive effect of stock-based compensation 367,914 137,587 31,762
Adjusted weighted average number of common shares 50,793,954 50,124,113 49,849,894
Basic net income per common share $ 4.03 $ 3.34 $ 3.59
Diluted net income per common share $ 4.00 $ 3.33 $ 3.59
Retained Earnings      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income $ 203.4 $ 166.9 $ 178.8