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Segment Information - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Projects
Market
State
Segments
OperatingDivisions
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Projects
Market
State
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Segment Reporting Information [Line Items]            
Document Period End Date       Jun. 30, 2019    
Proceeds from Sale of Buildings       $ 143.8 $ 261.1  
Gain (Loss) on Sale of Properties $ 22.6   $ 0.0 53.9 14.5  
Total assets 15,224.0     15,224.0   $ 14,114.6
Other Segments [Member]            
Segment Reporting Information [Line Items]            
Gain (Loss) on Sale of Properties 22.6   0.0 51.9 0.0  
Total assets $ 273.2     $ 273.2   198.9
Home Building [Member]            
Segment Reporting Information [Line Items]            
Number of housing construction markets | Market 87     87    
Number of housing construction states | State 29     29    
Number of home building operating divisions | OperatingDivisions 51          
Number of homebuilding reporting segments | Segments 6          
Gain (Loss) on Sale of Properties $ 0.0   0.0 $ 2.0 13.4  
Total assets $ 12,613.2     $ 12,613.2   12,132.8
Forestar Group [Member]            
Segment Reporting Information [Line Items]            
Number of housing construction markets | Market 50     50    
Number of housing construction states | State 20     20    
Gain (Loss) on Sale of Properties $ 1.5   $ 1.3 $ 2.4 $ 4.0  
Total assets 1,325.2     1,325.2   893.1
Multifamily [Member] | Other Segments [Member]            
Segment Reporting Information [Line Items]            
Total assets $ 167.2     $ 167.2   $ 173.2
Asset under Construction [Member] | Multifamily [Member] | Other Segments [Member]            
Segment Reporting Information [Line Items]            
Number of Projects | Projects 5     5    
Assets Leased to Others [Member] | Multifamily [Member] | Other Segments [Member]            
Segment Reporting Information [Line Items]            
Number of Projects | Projects 1     1    
DHIC2 [Member] | Multifamily [Member] | Other Segments [Member]            
Segment Reporting Information [Line Items]            
Proceeds from Sale of Buildings $ 60.0     $ 60.0    
Gain (Loss) on Sale of Properties $ 22.6     $ 22.6    
DHIC1 [Member] | Multifamily [Member] | Other Segments [Member]            
Segment Reporting Information [Line Items]            
Proceeds from Sale of Buildings   $ 73.4        
Gain (Loss) on Sale of Properties   $ 29.3