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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Commitments and Contingencies [Abstract] |  |  |  |
Earnest money deposits | $ 2,300.0 |  | $ 2,300.0 |
Remaining purchase price of land under option contracts | 25,600.0 |  | 25,600.0 |
Surety bonds | 3,400.0 |  | 3,400.0 |
Outstanding letters of credit | 234.2 |  | 234.2 |
Option Contracts Subject to Specific Performance Clauses [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Remaining purchase price of land under option contracts | 201.4 |  | 201.4 |
Cash [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Earnest money deposits | 2,100.0 |  | 2,100.0 |
Notes Payable, Other Payables [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Earnest money deposits | 154.0 |  | 154.0 |
Home Building Consolidated |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Outstanding letters of credit | 211.9 |  | 211.9 |
Forestar Group [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Outstanding letters of credit | 22.3 |  | 22.3 |
Forestar Group [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Earnest money deposits | 223.8 |  | 223.8 |
Remaining purchase price of land under option contracts | 2,200.0 |  | 2,200.0 |
Increase (Decrease) in Earnest Money Deposits Outstanding | 4.6 | $ 5.4 | 14.6 | $ 18.7
Increase (Decrease) in Prepaid Expenses, Other | 4.0 | $ 6.1 | 8.2 | $ 10.7
Forestar Group [Member] | Option Contracts Subject to Specific Performance Clauses [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Remaining purchase price of land under option contracts | $ 181.9 |  | $ 181.9 |

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- Definition Commitments and contingencies. + References No definition available. + Details
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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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- Definition The increase (decrease) during the reporting period in the amount of deposits given by the reporting entity to a seller which shows that the prospective buyer is serious about purchasing a property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition Amount of increase (decrease) of consideration paid in advance for other costs that provide economic benefits in future periods. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-15 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-12 + Details
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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
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- Definition The noncurrent portion of the carrying value as of the balance sheet date of a type of municipal bond typically used to fund a development project. Also called special assessment limited liability bond, special district bond, special purpose bond, special tax bond and community development obligation. Interest owed to lenders is paid by taxes levied on the community benefiting from the particular bond-funded project. For example, if a bond of this sort was issued to pay for sidewalks to be repaved in a certain community, an additional tax would be levied on homeowners in the area benefiting from this project. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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