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Income Taxes - Deferred Taxes Table (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Components of Deferred Tax Assets [Abstract] |  |
Real estate | $ 16.7 | $ 11.9
Corporate AMT credit carryforwards | 16.5 | 0.0
Employee benefits | 4.4 | 3.8
Net operating loss carryforwards | 0.7 | 0.9
Accruals not deductible until paid | 1.2 | 0.8
Total deferred tax assets | 39.5 | 17.4
Valuation allowance | (0.6) | (0.8)
Total deferred tax assets, net of valuation allowance | 38.9 | 16.6
Components of Deferred Tax Liabilities [Abstract] |  |
Deferral of profit on lot sales | (125.1) | (84.1)
Total deferred tax liabilities | (125.1) | (84.1)
Deferred tax liability, net | $ (86.2) | $ (67.5)

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