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Related Party Disclosures (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2024
USD ($)
Lot
Jun. 30, 2023
USD ($)
Lot
Jun. 30, 2024
USD ($)
Lot
Jun. 30, 2023
USD ($)
Lot
Sep. 30, 2023
USD ($)
Lot
Related Party Transaction [Line Items]          
Selling, general and administrative expense $ 29.3 $ 26.4 $ 86.5 $ 71.3  
Number of Units in Real Estate Property | Lot 57,900   57,900   52,400
Revenues $ 318.4 368.9 $ 958.0 887.1  
Tract sales and other 12.1 23.8 18.6 68.2  
Payments to Acquire Residential Real Estate     441.4    
D.R. Horton, Inc. [Member]          
Related Party Transaction [Line Items]          
Selling, general and administrative expense     4.1 2.8  
Employee Benefits and Share-Based Compensation     7.0 6.6  
Costs and Expenses, Related Party     0.7 1.2  
Related Party Transaction, Purchases from Related Party 0.1 0.1 0.8 0.6  
Accrued Liabilities and Other Liabilities 1.8   1.8   $ 3.2
D.R. Horton, Inc. [Member] | Deposits [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Amounts of Transaction 4.0   22.7 0.1  
D.R. Horton, Inc. [Member] | Other Expense [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Amounts of Transaction $ 4.4 $ 6.7 15.1 $ 17.1  
R&R          
Related Party Transaction [Line Items]          
Payments to Acquire Residential Real Estate     $ 11.3    
D.R. Horton, Inc. [Member]          
Related Party Transaction [Line Items]          
Number of Lots Sold | Lot 2,903 3,187 8,842 7,947  
Revenues $ 265.6 $ 270.4 $ 846.6 $ 677.4  
Deferred Revenue, Period Increase (Decrease) (0.2) 0.6 2.6 4.0  
Tract sales and other $ 1.2 $ 0.8 $ 2.5 $ 1.0  
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] | Land held for future development          
Related Party Transaction [Line Items]          
Number of Lots Sold | Lot 32 45 32 424  
Revenues $ 2.1 $ 22.8 $ 2.1 $ 55.3  
D.R. Horton, Inc. [Member] | Under Contract [Member]          
Related Party Transaction [Line Items]          
Number of Units in Real Estate Property | Lot 19,500   19,500   14,400
Related Party Deposit Liabilities $ 155.4   $ 155.4   $ 117.1
Related Party Transaction, Purchase Obligation from Parent $ 1,719.8   $ 1,719.8   $ 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 16,700   16,700   17,000