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Basis of Presentation (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2017
USD ($)
Market
State
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Oct. 05, 2017
USD ($)
Sep. 30, 2017
USD ($)
Entity Information [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired     75.00%  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 25.00%      
Accounts payable $ 575.7     $ 580.4
Accrued expenses and other liabilities 1,068.1     985.0
Payments Related to Tax Withholding for Share-based Compensation 10.3 $ 5.1    
Payments to Acquire Businesses and Interest in Affiliates 558.3      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     $ 401.9  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory     344.7  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets     99.2  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets     51.2  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     917.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable     4.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other     49.4  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt     130.1  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     183.5  
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value     175.2  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest     558.3  
Business Acquisition, Transaction Costs 7.2      
Business Combination, Acquisition Related Costs 5.3      
Business Acquisition, Pro Forma Revenue 3,332.7 2,968.7    
Business Acquisition, Pro Forma Net Income (Loss) $ 192.7 $ 237.6    
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares $ 0.50 $ 0.63    
Goodwill $ 100.0     80.0
Financial Services [Member]        
Entity Information [Line Items]        
Accounts payable 1.6     1.5
Accrued expenses and other liabilities 30.9     35.6
Goodwill 0.0     0.0
Financial Services and Other [Member]        
Entity Information [Line Items]        
Accounts payable and other liabilities       56.7
Accounts payable       4.8
Accrued expenses and other liabilities       51.9
Forestar Group [Member]        
Entity Information [Line Items]        
Accounts payable 2.4      
Accrued expenses and other liabilities $ 45.5      
Number of housing construction markets | Market 16      
Number of States in which Entity Operates | State 11      
Goodwill $ 0.0      
Other Segments [Member]        
Entity Information [Line Items]        
Accounts payable 4.7     3.3
Accrued expenses and other liabilities 18.3     16.3
Goodwill $ 0.0     $ 0.0
Forestar Consolidated [Member]        
Entity Information [Line Items]        
Goodwill     $ 20.0  
Accounting Standards Update 2016-09 [Member]        
Entity Information [Line Items]        
Payments Related to Tax Withholding for Share-based Compensation   $ 5.1    
Minimum [Member] | Inventories [Member] | Forestar Consolidated [Member]        
Entity Information [Line Items]        
Fair Value Inputs, Discount Rate 16.00%      
Maximum [Member] | Inventories [Member] | Forestar Consolidated [Member]        
Entity Information [Line Items]        
Fair Value Inputs, Discount Rate 22.00%