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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Liabilities for various claims, complaints and other legal actions | $ 617.1 | $ 524.4 | $ 617.1 | $ 524.4 | $ 577.5 | $ 473.8
Construction defect portion of loss contingency accrual, percentage | 99.00% |  | 99.00% |  | 99.00% |
Expenses related to legal claims |  |  | $ 44.1 | 37.3 |  |
Estimated insurance recoveries related to legal claims | $ 112.0 | 90.5 | 112.0 | 90.5 | $ 109.5 |
Earnest money deposits | 1,400.0 |  | 1,400.0 |  |  |
Remaining purchase price of land under option contracts | 18,700.0 |  | 18,700.0 |  |  |
Surety bonds | 2,500.0 |  | 2,500.0 |  |  |
Outstanding letters of credit | 236.1 |  | 236.1 |  |  |
Option Contracts Subject to Specific Performance Clauses [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Remaining purchase price of land under option contracts | 91.1 |  | 91.1 |  |  |
Cash [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Earnest money deposits | 1,300.0 |  | 1,300.0 |  |  |
Notes Payable, Other Payables [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Earnest money deposits | 86.1 |  | 86.1 |  |  |
Home Building Consolidated |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Outstanding letters of credit | 175.6 |  | 175.6 |  |  |
Forestar Group [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Outstanding letters of credit | 60.5 |  | 60.5 |  |  |
Forestar Group [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Earnest money deposits | 137.7 |  | 137.7 |  |  |
Remaining purchase price of land under option contracts | 1,500.0 |  | 1,500.0 |  |  |
Increase (Decrease) in Earnest Money Deposits Outstanding | 2.7 | 8.0 | 5.4 | 24.2 |  |
Increase (Decrease) in Prepaid Expenses, Other | 16.2 | $ 7.3 | 37.8 | $ 28.2 |  |
Forestar Group [Member] | Option Contracts Subject to Specific Performance Clauses [Member] |  |  |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |  |  |
Remaining purchase price of land under option contracts | $ 64.8 |  | $ 64.8 |  |  |

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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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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