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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Liabilities for various claims, complaints and other legal actions | $ 524.4 | $ 442.2 | $ 524.4 | $ 442.2 | $ 473.8 | $ 434.7
Construction defect portion of loss contingency accrual, percentage | 99.00% |  | 99.00% |  | 99.00% |
Expenses related to legal claims |  |  | $ 37.3 | 26.6 |  |
Estimated insurance recoveries related to legal claims | $ 90.5 | 76.6 | 90.5 | 76.6 | $ 81.2 |
Surety bonds | 2,100.0 |  | 2,100.0 |  |  |
Outstanding letters of credit | 189.6 |  | 189.6 |  |  |
Home Building Consolidated |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Outstanding letters of credit | 143.6 |  | 143.6 |  |  |
Forestar Group [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Outstanding letters of credit | 46.0 |  | 46.0 |  |  |
HomeBuildingMember |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Earnest money deposits | 873.9 |  | 873.9 |  |  |
Remaining purchase price of land under option contracts | 13,500.0 |  | 13,500.0 |  |  |
HomeBuildingMember | Option Contracts Subject to Specific Performance Clauses [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Remaining purchase price of land under option contracts | 80.5 |  | 80.5 |  |  |
HomeBuildingMember | Cash [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Earnest money deposits | 798.6 |  | 798.6 |  |  |
HomeBuildingMember | Notes Payable, Other Payables [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Earnest money deposits | 75.3 |  | 75.3 |  |  |
Forestar Group [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Earnest money deposits | 139.6 |  | 139.6 |  |  |
Remaining purchase price of land under option contracts | 1,500.0 |  | 1,500.0 |  |  |
Increase (Decrease) in Earnest Money Deposits Outstanding | 8.0 | 5.5 | 24.2 | 16.2 |  |
Increase (Decrease) in Prepaid Expenses, Other | 7.3 | $ 8.2 | 28.2 | $ 13.3 |  |
Forestar Group [Member] | Option Contracts Subject to Specific Performance Clauses [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Remaining purchase price of land under option contracts | $ 41.5 |  | $ 41.5 |  |  |

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- Definition A deposit made by a purchaser of real estate to evidence good faith. It is customary for a buyer to give the seller earnest money at the time a sales contract is signed. The earnest money generally is credited to the down payment at closing, which is applied at closing as a component of payment against the purchase price. + References No definition available. + Details
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