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Income Taxes - Income Tax Expense Table (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current Federal Tax Expense (Benefit) $ 40.8 $ 33.9 $ 38.3
Current State and Local Tax Expense (Benefit) 9.1 7.0 6.2
Total 49.9 40.9 44.5
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Deferred Federal Income Tax Expense (Benefit) 13.4 11.5 10.2
Deferred State and Local Income Tax Expense (Benefit) 3.4 2.3 2.3
Total 16.8 13.8 12.5
Income Tax Expense (Benefit), Total $ 66.7 $ 54.7 $ 57.0