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Income Taxes - Text (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Operating Loss Carryforwards [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards $ 0.9 $ 1.0  
Deferred Tax Assets, Valuation Allowance (0.8) (0.9)  
Unrecognized Tax Benefits 0.0 0.0 $ 0.0
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards 0.9    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 0.4    
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration 0.5    
D.R. Horton, Inc. [Member] | Reimbursement To Parent [Member]      
Operating Loss Carryforwards [Line Items]      
Related Party Transaction, Amounts of Transaction $ 2.2 $ 1.7 $ 0.7