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Income Taxes - Deferred Taxes Table (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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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)

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