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Related Party Transactions (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
USD ($)
Lot
Mar. 31, 2020
USD ($)
Lot
Mar. 31, 2021
USD ($)
Lot
Mar. 31, 2020
USD ($)
Lot
Sep. 30, 2020
USD ($)
Lot
Related Party Transaction [Line Items]          
Number of Units in Real Estate Property | Lot 84,500   84,500   60,500
Number of Lots Sold | Lot 3,588 1,951 7,155 4,373  
Real estate $ 1,698.6   $ 1,698.6   $ 1,309.7
Inventory, Land Held for Development and Sale 55.5   55.5   5.4
Revenues 287.1 $ 159.1 594.2 $ 406.4  
D.R. Horton, Inc. [Member]          
Related Party Transaction [Line Items]          
Due to Related Parties, Current 1.1   1.1   $ 8.4
Deferred Revenue, Period Increase (Decrease) (0.2) 0.8   (0.6)  
Related Party Transaction, Purchases from Related Party $ 1.2 $ 1.5 2.9 2.9  
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party     2.0 2.6  
Related Party Transaction, Expenses from Transactions with Related Party     1.8 1.0  
Costs and Expenses, Related Party     $ 1.4 $ 1.3  
D.R. Horton, Inc. [Member] | Maximum [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Rate     16.00%    
D.R. Horton, Inc. [Member] | Minimum [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Rate     12.00%    
D.R. Horton, Inc. [Member]          
Related Party Transaction [Line Items]          
Number of Lots Sold | Lot 3,358 1,906 6,747 4,296  
Revenue from Related Parties $ 265.6 $ 151.2 $ 559.6 $ 366.8  
Under Contract [Member] | D.R. Horton, Inc. [Member]          
Related Party Transaction [Line Items]          
Number of Units in Real Estate Property | Lot 20,400   20,400   14,000
Related Party Transaction, Purchase Obligation from Parent $ 1,505.3   $ 1,505.3   $ 1,022.2
Under Contract [Member] | D.R. Horton, Inc. [Member] | Notes Payable, Other Payables          
Related Party Transaction [Line Items]          
Related Party Deposit Liabilities 2.6   2.6   4.8
Under Contract [Member] | D.R. Horton, Inc. [Member] | Cash          
Related Party Transaction [Line Items]          
Related Party Deposit Liabilities $ 134.1   $ 134.1   $ 92.2
Right of First Offer [Member] | D.R. Horton, Inc. [Member]          
Related Party Transaction [Line Items]          
Number of Units in Real Estate Property | Lot 16,700   16,700   16,400
Other Expense [Member] | D.R. Horton, Inc. [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Amounts of Transaction $ 7.3 8.2 $ 28.2 13.3  
Deposits [Member] | D.R. Horton, Inc. [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Amounts of Transaction $ 8.0 $ 5.5 $ 24.2 $ 16.2  
Land [Member] | D.R. Horton, Inc. [Member]          
Related Party Transaction [Line Items]          
Number of Lots Sold | Lot 14 0 14 36  
Revenue from Related Parties $ 3.0 $ 0.0 $ 3.0 $ 7.2  
Real Estate [Member]          
Related Party Transaction [Line Items]          
Revenues $ 280.2 $ 156.4 $ 587.1 $ 373.5