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Related Party Transactions (Details)
3 Months Ended
Dec. 31, 2018
USD ($)
Lot
Dec. 31, 2017
USD ($)
Oct. 01, 2018
USD ($)
Sep. 30, 2018
USD ($)
Lot
Related Party Transaction [Line Items]        
Number of Units in Real Estate Property | Lot 25,600      
Due to Related Parties, Current       $ 3,300,000
Deferred Revenue $ 10,900,000     11,600,000
Contract with Customer, Liability 10,000,000   $ 6,400,000 0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest   $ (12,300,000)    
Real estate 693,200,000     498,000,000
Due from Related Parties, Current 400,000      
D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 500,000 $ 0    
General and Administrative Expense [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party $ 300,000      
D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Number of Lots Sold 455 0    
Revenue from Related Parties $ 29,000,000      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ 4,400,000      
Under Contract [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Number of Units in Real Estate Property | Lot 9,400      
Related Party Deposit Liabilities $ 63,100,000     45,300,000
Right of First Offer [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Number of Units in Real Estate Property | Lot 9,400      
Land and Land Improvements [Member]        
Related Party Transaction [Line Items]        
Real estate $ 644,700,000     463,100,000
Land [Member]        
Related Party Transaction [Line Items]        
Real estate 48,500,000     $ 34,900,000
Other Expense [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction 3,000,000      
Deposits [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction $ 12,100,000 $ 2,300,000    
Land and Land Improvements [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Number of Units in Real Estate Property | Lot 261     168
Deferred Revenue       $ 6,400,000
Deferred Revenue and Credits       $ 800,000
Contract with Customer, Liability $ 10,000,000      
Minimum [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Investment Interest Rate 12.00%      
Maximum [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Investment Interest Rate 16.00%