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Related Party Disclosures (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2025
USD ($)
Lot
Sep. 30, 2024
USD ($)
Lot
Sep. 30, 2023
USD ($)
Lot
Related Party Transaction [Line Items]      
Selling, general and administrative expense $ 154.4 $ 118.5 $ 97.7
Number of Units in Real Estate Property | Lot 65,100 57,800  
Revenues $ 1,662.4 $ 1,509.4 1,436.9
Tract sales and other 118.1 42.0 132.2
Contract assets 0.0 8.9  
D.R. Horton, Inc. [Member]      
Related Party Transaction [Line Items]      
Selling, general and administrative expense 7.3 5.6 3.8
Employee Benefits and Share-Based Compensation 14.4 9.6 8.5
Costs and Expenses, Related Party 1.6 3.1 2.9
Deferred Revenue, Period Increase (Decrease) 1.1 2.9 0.0
Related Party Transaction, Purchases from Related Party 0.4 0.9 0.8
Accrued Liabilities and Other Liabilities 2.2 5.2  
Contract assets 6.5    
D.R. Horton, Inc. [Member] | Reimbursement To Parent [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ 0.9 2.2 1.7
D.R. Horton, Inc. [Member] | Minimum      
Related Party Transaction [Line Items]      
Related Party Transaction, Rate 12.00%    
D.R. Horton, Inc. [Member] | Maximum      
Related Party Transaction [Line Items]      
Related Party Transaction, Rate 16.00%    
D.R. Horton, Inc. [Member] | Deposits [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ 20.6 27.5 10.9
D.R. Horton, Inc. [Member] | Other Expense [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 26.5 22.9 $ 21.8
D.R. Horton, Inc. [Member] | Use Rights      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ 2.1    
Ryan Horton and Reagan Horton      
Related Party Transaction [Line Items]      
Related Party Transaction, Purchases from Related Party   $ 11.3  
D.R. Horton, Inc. [Member]      
Related Party Transaction [Line Items]      
Number of Lots Sold | Lot 11,751 13,267 12,249
Revenues $ 1,277.6 $ 1,271.4 $ 1,094.7
D.R. Horton, Inc. [Member] | Land held for future development      
Related Party Transaction [Line Items]      
Tract sales and other $ 99.5 $ 23.7 $ 115.1
D.R. Horton, Inc. [Member] | Under Contract [Member]      
Related Party Transaction [Line Items]      
Number of Units in Real Estate Property | Lot 22,800 20,500  
Related Party Deposit Liabilities $ 179.7 $ 168.4  
Related Party Transaction, Purchase Obligation from Parent $ 2,000.0 $ 1,840.5  
D.R. Horton, Inc. [Member] | Right of First Offer [Member]      
Related Party Transaction [Line Items]      
Number of Units in Real Estate Property | Lot 17,600 17,200