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Income Taxes - Deferred Taxes Table (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Components of Deferred Tax Assets [Abstract]    
Deferred Tax Assets, Inventory $ 11.9 $ 10.5
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits 3.8 2.8
Deferred Tax Assets, Operating Loss Carryforwards 0.9 1.0
Deferred Tax Assets, Other 0.8 0.8
Deferred Tax Assets, Gross, Total 17.4 15.1
Deferred Tax Assets, Valuation Allowance (0.8) (0.9)
Deferred Tax Assets, Net of Valuation Allowance, Total 16.6 14.2
Components of Deferred Tax Liabilities [Abstract]    
Deferred Tax Liabilities, Tax Deferred Income (84.1) (64.9)
Deferred Tax Liabilities, Gross (84.1) (64.9)
Deferred Tax Liabilities, Net $ (67.5) $ (50.7)