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Income Taxes - Deferred Taxes Table (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Deferred tax assets:    
Real estate $ 11.5 $ 14.2
Employee benefits 2.8 1.9
Net operating loss carryforwards 1.2 1.4
Accruals not deductible until paid 0.2 0.2
Total deferred tax assets 15.7 17.7
Valuation allowance (1.0) (1.2)
Total deferred tax assets, net of valuation allowance 14.7 16.5
Deferred tax liabilities:    
Deferral of profit on lot sales (51.6) (40.9)
Total deferred tax liabilities (51.6) (40.9)
Deferred tax liability, net $ (36.9) $ (24.4)