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Commitments and Contingencies (Details Textuals) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Loss Contingency [Abstract] |  |  |
Liabilities for various claims, complaints and other legal actions | $ 473.8 | $ 434.7 | $ 408.1
Construction defect portion of loss contingency accrual | 99.00% | 99.00% |
Expenses related to legal claims | $ 64.4 | $ 15.3 | 41.0
Maximum amount deductible under workers compensation insurance policy | 0.5 |  |
Deductible policy amount per occurrence | 0.5 | 0.5 |
Estimated insurance recoveries related to legal claims | 81.2 | 75.1 |
Other Commitments [Abstract] |  |  |
Surety bonds | 1,800.0 |  |
Outstanding letters of credit | 178.9 |  |
Rent expense | 31.5 | 30.5 | $ 27.8
Home Building [Member] |  |  |
Land and Lot Option Purchase Contracts [Abstract] |  |  |
Deposits | 653.4 |  |
Purchase Obligation | 9,900.0 |  |
Home Building [Member] | Cash Deposits [Member] |  |  |
Land and Lot Option Purchase Contracts [Abstract] |  |  |
Deposits | 584.5 |  |
Home Building [Member] | Promissory notes and letters of credit [Member] |  |  |
Land and Lot Option Purchase Contracts [Abstract] |  |  |
Deposits | 68.9 |  |
Forestar Consolidated [Member] |  |  |
Land and Lot Option Purchase Contracts [Abstract] |  |  |
Deposits | 98.2 |  |
Purchase Obligation | 1,000.0 |  |
Other Commitments [Abstract] |  |  |
Outstanding letters of credit | 36.0 |  |
Forestar Group [Member] |  |  |
Land and Lot Option Purchase Contracts [Abstract] |  |  |
Increase (Decrease) in Earnest Money Deposits Outstanding | 27.0 | 34.5 |
Increase (Decrease) in Prepaid Expenses, Other | 36.3 | $ 13.1 |
Home Building Consolidated |  |  |
Other Commitments [Abstract] |  |  |
Outstanding letters of credit | 142.9 |  |
Option Contracts Subject to Specific Performance Clauses [Member] | Home Building [Member] |  |  |
Land and Lot Option Purchase Contracts [Abstract] |  |  |
Purchase Obligation | 32.6 |  |
Option Contracts Subject to Specific Performance Clauses [Member] | Forestar Consolidated [Member] |  |  |
Land and Lot Option Purchase Contracts [Abstract] |  |  |
Purchase Obligation | $ 1.4 |  |

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- Definition The portion of the total reserve for legal claims that relates to the entity's construction defect matters, expressed as a percentage. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + 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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