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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Liabilities for various claims, complaints and other legal actions | $ 849.3 | $ 768.3 | $ 849.3 | $ 768.3 | $ 858.9 | $ 729.1
Construction defect portion of loss contingency accrual, percentage | 97.00% |  | 97.00% |  | 97.00% |
Expenses related to legal claims |  |  | $ 63.6 | 53.3 |  |
Estimated insurance recoveries related to legal claims | $ 134.8 | 139.0 | 134.8 | 139.0 | $ 165.8 |
Earnest money deposits | 1,900.0 |  | 1,900.0 |  |  |
Remaining purchase price of land under option contracts | 23,100.0 |  | 23,100.0 |  |  |
Surety bonds | 3,200.0 |  | 3,200.0 |  |  |
Outstanding letters of credit | 241.7 |  | 241.7 |  |  |
Option Contracts Subject to Specific Performance Clauses [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Remaining purchase price of land under option contracts | 268.3 |  | 268.3 |  |  |
Cash [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Earnest money deposits | 1,800.0 |  | 1,800.0 |  |  |
Notes Payable, Other Payables [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Earnest money deposits | 141.8 |  | 141.8 |  |  |
Home Building Consolidated |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Outstanding letters of credit | 213.7 |  | 213.7 |  |  |
Forestar Group [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Outstanding letters of credit | 28.0 |  | 28.0 |  |  |
Forestar Group [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Earnest money deposits | 158.2 |  | 158.2 |  |  |
Remaining purchase price of land under option contracts | 1,500.0 |  | 1,500.0 |  |  |
Increase (Decrease) in Earnest Money Deposits Outstanding | 5.4 |  | 18.7 |  |  |
Increase (Decrease) in Prepaid Expenses, Other | 6.1 | $ 5.7 | 10.7 | $ 10.4 |  |
Forestar Group [Member] | Option Contracts Subject to Specific Performance Clauses [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Remaining purchase price of land under option contracts | $ 243.9 |  | $ 243.9 |  |  |

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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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