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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income $ 167.9 $ 203.4 $ 166.9
Weighted average number of common shares 50,872,335 50,426,040 49,986,526
Dilutive effect of stock-based compensation 187,517 367,914 137,587
Adjusted weighted average number of common shares 51,059,852 50,793,954 50,124,113
Basic net income per common share $ 3.30 $ 4.03 $ 3.34
Diluted net income per common share $ 3.29 $ 4.00 $ 3.33