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Notes Payable - Narrative (Details)
 3 Months Ended 9 Months Ended
Aug. 01, 2018
USD ($)
Aug. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
Oct. 05, 2017
USD ($)
Sep. 30, 2017
USD ($)
Debt Instrument [Line Items]              
Debt issuance costs     $ 9,300,000   $ 9,300,000   $ 9,500,000
Notes payable     3,093,600,000   3,093,600,000   2,871,600,000
Outstanding letters of credit     110,000,000   110,000,000    
Restricted Cash and Cash Equivalents     58,700,000   58,700,000   16,500,000
Homebuilding [Member]              
Debt Instrument [Line Items]              
Notes payable     2,447,100,000   2,447,100,000   2,451,600,000
Borrowing capacity on revolving credit facility     1,275,000,000   1,275,000,000    
Maximum borrowing capacity on revolving credit facility     $ 1,900,000,000   $ 1,900,000,000    
Letters of credit, sublimit borrowing capacity, as a percentage     50.00%   50.00%    
Proceeds from revolving credit facility         $ 1,800,000,000    
Repayments of revolving credit facility         1,800,000,000    
Borrowings outstanding on revolving credit facility     $ 0   0   0
Authorized repurchase of debt securities   $ 500,000,000          
Debt repurchase program, remaining authorized repurchase amount     500,000,000   500,000,000    
Restricted Cash and Cash Equivalents     11,200,000   11,200,000   9,300,000
Homebuilding [Member] | 3.625% senior notes due 2018 [Member]              
Debt Instrument [Line Items]              
Notes payable     $ 0   $ 0   399,700,000
Early Repayment of Senior Debt       $ 400,000,000      
Stated interest rate     3.625% 3.625% 3.625%    
Homebuilding [Member] | 2.55% senior notes due 2020 [Member]              
Debt Instrument [Line Items]              
Notes payable     $ 397,800,000   $ 397,800,000   0
Debt Instrument, Face Amount       $ 400,000,000      
Debt Instrument, Interest Rate, Effective Percentage       2.80%      
Stated interest rate     2.55% 2.55% 2.55%    
Financial Services [Member]              
Debt Instrument [Line Items]              
Notes payable     $ 526,300,000   $ 526,300,000   420,000,000
Borrowing capacity on revolving credit facility     600,000,000   600,000,000    
Maximum borrowing capacity on revolving credit facility     1,000,000,000   1,000,000,000    
Restricted Cash and Cash Equivalents     7,500,000   7,500,000   $ 7,200,000
Mortgage loans held for sale pledged under repurchase agreement     639,400,000   639,400,000    
Mortgage loans held for sale pledged under repurchase agreement, collateral value     619,800,000   619,800,000    
Advance pay downs on mortgage repurchase facility     $ 93,500,000   $ 93,500,000    
Interest rate on mortgage repurchase facility     3.90%   3.90%    
Forestar Group [Member]              
Debt Instrument [Line Items]              
Notes payable     $ 110,500,000   $ 110,500,000    
Borrowing capacity on revolving credit facility     30,000,000   30,000,000 $ 50,000,000  
Letter of Credit, Maximum Borrowing Capacity (in dollars)           50,000,000  
Outstanding letters of credit     21,500,000   21,500,000    
Restricted Cash and Cash Equivalents     $ 40,000,000   $ 40,000,000    
Forestar Group [Member] | 3.75% convertible senior notes due 2020 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount           $ 120,000,000  
Early Repayment of Senior Debt       $ 1,100,000      
Debt Instrument, Convertible, Conversion Ratio     0.00817192 0.0408351      
Debt Instrument, Convertible, Conversion Price | $ / shares     $ 579.77062   $ 579.77062    
Stated interest rate     3.75%   3.75%    
Line of Credit [Member] | Homebuilding [Member]              
Debt Instrument [Line Items]              
Outstanding letters of credit     $ 87,100,000   $ 87,100,000    
Weighted Average [Member] | Financial Services [Member]              
Debt Instrument [Line Items]              
Borrowing capacity on revolving credit facility     725,000,000   725,000,000    
Maximum [Member] | Financial Services [Member]              
Debt Instrument [Line Items]              
Borrowing capacity on revolving credit facility     800,000,000   800,000,000    
Subsequent Event [Member] | Homebuilding [Member]              
Debt Instrument [Line Items]              
Authorized repurchase of debt securities $ 500,000,000            
Segment Reconciling Items [Member]              
Debt Instrument [Line Items]              
Notes payable     9,700,000   9,700,000    
Restricted Cash and Cash Equivalents     $ 0   $ 0