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Basis of Presentation (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
Market
State
$ / shares
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
Market
State
$ / shares
Mar. 31, 2017
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%     25.00%      
Accounts payable $ 582.7     $ 582.7     $ 580.4
Accrued expenses and other liabilities 1,029.6     1,029.6     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           334.6  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets           98.5  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets           51.6  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets           915.8  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable           2.8  
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           182.3  
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 3,794.7   $ 3,273.6 7,127.6 6,242.3    
Business Acquisition, Pro Forma Net Income (Loss) $ 351.0   $ 249.6 $ 543.7 $ 487.2    
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares $ 0.91   $ 0.66 $ 1.42 $ 1.29    
Goodwill $ 109.2     $ 109.2     80.0
Financial Services [Member]              
Entity Information [Line Items]              
Accounts payable 3.0     3.0     1.5
Accrued expenses and other liabilities 35.6     35.6     35.6
Goodwill 0.0     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 2.1     2.1      
Accrued expenses and other liabilities $ 59.2     $ 59.2      
Number of housing construction markets | Market 18     18      
Number of States in which Entity Operates | State 10     10      
Goodwill $ 0.0     $ 0.0      
Other Segments [Member]              
Entity Information [Line Items]              
Accounts payable 8.7     8.7     3.3
Accrued expenses and other liabilities 15.2     15.2     16.3
Goodwill $ 0.0     $ 0.0     $ 0.0
Forestar Consolidated [Member]              
Entity Information [Line Items]              
Goodwill           $ 29.2  
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%