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Related Party Disclosures (Details)
$ in Millions
12 Months Ended
Sep. 30, 2021
USD ($)
Lot
Sep. 30, 2020
USD ($)
Lot
Sep. 30, 2019
USD ($)
Lot
Related Party Transaction [Line Items]      
Number of Units in Real Estate Property | Lot 64,400 42,400  
Number of Lots Sold | Lot 15,915 10,373 4,132
Due to Related Parties, Current $ 6.7 $ 8.4  
D.R. Horton, Inc. [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 4.0 5.0 $ 2.1
Related Party Transaction, Expenses from Transactions with Related Party 4.7 2.7 1.4
Costs and Expenses, Related Party 6.1 4.0 1.2
Deferred Revenue, Period Increase (Decrease) (5.6) 2.3 4.0
Related Party Transaction, Purchases from Related Party 5.7 6.2 2.4
D.R. Horton, Inc. [Member] | Reimbursement To Parent [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 0.5 0.2  
D.R. Horton, Inc. [Member] | Reimbursement From Parent [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction     0.4
D.R. Horton, Inc. [Member] | Deposits [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 30.8 27.0 34.5
D.R. Horton, Inc. [Member] | Other Expense [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 61.3 36.3 13.1
Residential Real Estate [Member] | Real Estate      
Related Party Transaction [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax $ 1,293.1 $ 880.3 $ 351.7
D.R. Horton, Inc. [Member]      
Related Party Transaction [Line Items]      
Number of Lots Sold | Lot 14,839 10,164 3,728
Revenue from Related Parties $ 1,212.1 $ 859.7 $ 311.7
D.R. Horton, Inc. [Member] | Land [Member]      
Related Party Transaction [Line Items]      
Number of Lots Sold | Lot 85 143 290
Revenue from Related Parties $ 25.9 $ 25.6 $ 10.9
D.R. Horton, Inc. [Member] | Under Contract [Member]      
Related Party Transaction [Line Items]      
Number of Units in Real Estate Property | Lot 21,000 14,000  
Related Party Transaction, Purchase Obligation from Parent $ 1,582.7 $ 1,022.2  
D.R. Horton, Inc. [Member] | Under Contract [Member] | Cash [Member]      
Related Party Transaction [Line Items]      
Related Party Deposit Liabilities 143.1 92.2  
D.R. Horton, Inc. [Member] | Under Contract [Member] | Notes Payable, Other Payables [Member]      
Related Party Transaction [Line Items]      
Related Party Deposit Liabilities $ 0.7 $ 4.8  
D.R. Horton, Inc. [Member] | Right of First Offer [Member]      
Related Party Transaction [Line Items]      
Number of Units in Real Estate Property | Lot 18,200 16,400