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Notes Payable (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2020
Feb. 01, 2020
Oct. 01, 2019
Sep. 30, 2019
Debt Instrument [Line Items]        
Document Period End Date Mar. 31, 2020      
Unsecured:        
Notes payable $ 4,306.6     $ 3,399.4
Home Building [Member]        
Debt Instrument [Line Items]        
Debt Repurchase Authorization Remaining 500.0      
Unsecured:        
Notes payable 2,480.0     2,047.6
Revolving credit facility 500.0     0.0
Unamortized Debt Issuance Expense 7.7     5.4
Forestar Group [Member]        
Unsecured:        
Notes payable 640.1     460.5
Unamortized Debt Issuance Expense 9.9     6.2
Financial Services [Member]        
Unsecured:        
Notes payable 1,186.5     888.9
Forestar Group [Member]        
Unsecured:        
Notes payable 640.1     462.9
Revolving credit facility $ 0.0     0.0
4.0% senior notes due 2020 [Member] | Home Building [Member]        
Unsecured:        
Stated interest rate 4.00%      
Notes payable $ 0.0     499.6
2.55% senior notes due 2020 [Member] | Home Building [Member]        
Unsecured:        
Stated interest rate 2.55%      
Notes payable $ 399.4     398.9
4.375% senior notes due 2022 [Member] | Home Building [Member]        
Unsecured:        
Stated interest rate 4.375%      
Notes payable $ 349.0     348.8
4.75% senior notes due 2023 [Member] | Home Building [Member]        
Unsecured:        
Stated interest rate 4.75%      
Notes payable $ 299.1     298.9
5.75% senior notes due 2023 [Member] | Home Building [Member]        
Unsecured:        
Stated interest rate 5.75%      
Notes payable $ 398.5     398.4
SeniorNoteFortyTwo [Member] | Home Building [Member]        
Unsecured:        
Stated interest rate 2.50%   2.50%  
Notes payable $ 496.0     0.0
Debt Instrument, Interest Rate, Effective Percentage     2.70%  
3.75% convertible senior notes due 2020 [Member] | Forestar Group [Member]        
Unsecured:        
Stated interest rate 3.75%      
3.75% convertible senior notes due 2020 [Member] | Forestar Group [Member]        
Unsecured:        
Notes payable $ 0.0     119.1
Senior Note Member Forty One [Member] | Forestar Group [Member]        
Unsecured:        
Stated interest rate 8.00%      
Senior Note Member Forty One [Member] | Forestar Group [Member]        
Unsecured:        
Notes payable $ 344.5     343.8
Senior Note Member Forty Three | Forestar Group [Member]        
Unsecured:        
Stated interest rate 5.00% 5.00%    
Debt Instrument, Interest Rate, Effective Percentage   5.20%    
Senior Note Member Forty Three | Forestar Group [Member]        
Unsecured:        
Notes payable $ 295.6     0.0
Secured Debt [Member] | Home Building [Member]        
Unsecured:        
Notes payable $ 38.0     $ 103.0