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Basis of Presentation (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2022
USD ($)
Segments
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Apr. 30, 2022
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
Entity Information [Line Items]          
Payments related to business acquisitions   $ 271.5 $ 24.4    
Deferred Income Tax Assets, Net $ 157.4 157.4     $ 155.3
Vidler Water Resources, Inc.          
Entity Information [Line Items]          
Payments related to business acquisitions 290.5        
Business Acquisition, Share Price | $ / shares       $ 15.75  
Business acquisition, cash and cash equivalents acquired       $ 19.0  
Business acquisition, property and equipment acquired       30.1  
Business acquisition, deferred income tax valuation allowance acquired       16.4  
Deferred Income Tax Assets, Net       16.3  
Business acquisition, intangible and other assets acquired $ 247.7 247.7   251.0 0.0
Business acquisition, total assets acquired       316.4  
Business acquisition, other liabilities acquired       7.7  
Business acquisition, total liabilities acquired       7.7  
Business acquisition, noncontrolling interest       18.2  
Business acquisition, net assets acquired       $ 290.5  
HomeBuildingMember          
Entity Information [Line Items]          
Number of homebuilding reporting segments | Segments 6        
Deferred Income Tax Assets, Net $ 145.3 $ 145.3     $ 159.2
Forestar Group [Member]          
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Noncontrolling Interest, Ownership Percentage by Parent 63.00% 63.00%      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 37.00% 37.00%      
Entity Information [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent 63.00% 63.00%      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 37.00% 37.00%