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Related Party Disclosures (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2023
USD ($)
Lot
Dec. 31, 2022
USD ($)
Lot
Sep. 30, 2023
USD ($)
Lot
Related Party Transaction [Line Items]      
Selling, General and Administrative Expense $ 28.0 $ 22.9  
Costs and Expenses, Related Party $ 0.3 0.6  
Number of Units in Real Estate Property | Lot 55,400   52,400
Revenues $ 305.9 216.7  
D.R. Horton, Inc. [Member]      
Related Party Transaction [Line Items]      
Selling, General and Administrative Expense 1.3 0.9  
Employee Benefits and Share-Based Compensation 2.4 2.3  
Deferred Revenue, Period Increase (Decrease) 0.7 2.7  
Related Party Transaction, Purchases from Related Party 0.5 0.2  
Accrued Liabilities and Other Liabilities 3.5   $ 3.2
D.R. Horton, Inc. [Member] | Deposits [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction   0.1  
D.R. Horton, Inc. [Member] | Other Expense [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 4.6 4.7  
Residential Real Estate [Member] | Real Estate      
Related Party Transaction [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax $ 304.2 $ 206.7  
D.R. Horton, Inc. [Member]      
Related Party Transaction [Line Items]      
Number of Lots Sold | Lot 2,834 2,094  
Revenues $ 272.8 $ 187.1  
D.R. Horton, Inc. [Member] | Under Contract [Member]      
Related Party Transaction [Line Items]      
Number of Units in Real Estate Property | Lot 16,200   14,400
Related Party Transaction, Purchase Obligation from Parent $ 1,500.8   $ 1,319.2
D.R. Horton, Inc. [Member] | Under Contract [Member] | Cash [Member]      
Related Party Transaction [Line Items]      
Related Party Deposit Liabilities $ 136.1   $ 117.1
D.R. Horton, Inc. [Member] | Right of First Offer [Member]      
Related Party Transaction [Line Items]      
Number of Units in Real Estate Property | Lot 17,500   17,000