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Related Party Disclosures (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2024
USD ($)
Lot
Sep. 30, 2023
USD ($)
Lot
Sep. 30, 2022
USD ($)
Lot
Related Party Transaction [Line Items]      
Selling, general and administrative expense $ 118.5 $ 97.7 $ 93.6
Number of Units in Real Estate Property | Lot 57,800 52,400  
Tract sales and other $ 42.0 $ 132.2 36.8
Revenue from Contract with Customer, Including Assessed Tax 1,459.3 1,275.7 1,455.5
Contract assets 8.9 0.0  
D.R. Horton, Inc. [Member]      
Related Party Transaction [Line Items]      
Selling, general and administrative expense 5.6 3.8 4.1
Employee Benefits and Share-Based Compensation 9.6 8.5 7.4
Costs and Expenses, Related Party 3.1 2.9 6.6
Related Party Transaction, Purchases from Related Party 0.9 0.8 2.8
Accrued Liabilities and Other Liabilities 5.2 3.2  
Contract assets 6.5    
D.R. Horton, Inc. [Member] | Reimbursement To Parent [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ 2.2 1.7 0.7
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 $ 27.5 10.9 8.7
D.R. Horton, Inc. [Member] | Other Expense [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 22.9 $ 21.8 $ 58.9
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 13,267 12,249 14,895
Other Income $ 8.5 $ 1.0 $ 0.0
Revenue from Contract with Customer, Including Assessed Tax 1,271.4 1,094.7 1,230.0
Deferred Revenue, Period Increase (Decrease) $ 2.9 $ 0.0 $ 1.8
D.R. Horton, Inc. [Member] | Land held for future development      
Related Party Transaction [Line Items]      
Number of Lots Sold | Lot 32 820 0
Tract sales and other $ 15.2 $ 114.1 $ 0.0
D.R. Horton, Inc. [Member] | Under Contract [Member]      
Related Party Transaction [Line Items]      
Number of Units in Real Estate Property | Lot 20,500 14,400  
Related Party Deposit Liabilities $ 168.4 $ 117.1  
Related Party Transaction, Purchase Obligation from Parent $ 1,840.5 $ 1,319.2  
D.R. Horton, Inc. [Member] | Right of First Offer [Member]      
Related Party Transaction [Line Items]      
Number of Units in Real Estate Property | Lot 17,200 17,000