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v3.8.0.1

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% |  |  |

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