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Notes Payable - Principal Amounts (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Summary of notes payable at principal amounts, net of unamortized discounts    
Notes payable $ 3,399.4 $ 3,203.5
Home Building [Member]    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Expense 5.4 8.5
Summary of notes payable at principal amounts, net of unamortized discounts    
Line of credit, amount outstanding 0.0 0.0
Notes payable 2,047.6 2,445.9
Forestar Group [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Notes payable 460.5 111.7
Financial Services [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Notes payable 888.9 637.7
Forestar Consolidated [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Line of credit, amount outstanding 0.0 0.0
Notes payable $ 462.9 119.9
Senior Note Twenty Nine [Member] | Home Building [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Senior notes, stated interest rate 3.75%  
Notes payable $ 0.0 499.6
Senior Note Member Thirty [Member] | Home Building [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Senior notes, stated interest rate 4.00%  
Notes payable $ 499.6 498.8
Senior Note Member Thirty-One [Member] | Home Building [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Senior notes, stated interest rate 2.55%  
Notes payable $ 398.9 397.9
Senior Note Member Twenty Five [Member] | Home Building [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Senior notes, stated interest rate 4.375%  
Notes payable $ 348.8 348.4
Senior Note Twenty Seven [Member] | Home Building [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Senior notes, stated interest rate 4.75%  
Notes payable $ 298.9 298.7
SeniorNoteTwentyEight [Member] | Home Building [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Senior notes, stated interest rate 5.75%  
Notes payable $ 398.4 398.0
Senior Note Member Forty [Member] | Forestar Group [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Senior notes, stated interest rate 3.75%  
Senior Note Member Forty [Member] | Forestar Consolidated [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Notes payable $ 119.1 119.9
Senior Note Member Forty One [Member] | Forestar Group [Member]    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Expense $ 6.2  
Summary of notes payable at principal amounts, net of unamortized discounts    
Senior notes, stated interest rate 8.00%  
Senior Note Member Forty One [Member] | Forestar Consolidated [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Notes payable $ 343.8 0.0
Secured Debt [Member] | Home Building [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Notes payable 103.0 4.5
Segment Reconciling Items [Member]    
Summary of notes payable at principal amounts, net of unamortized discounts    
Notes payable $ 2.4 $ 8.2