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v3.19.1

Related Party Transactions (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) a | Jun. 30, 2019 | Sep. 30, 2018 USD ($)
Related Party Transaction [Line Items] |  |  |
Inventory, Real Estate, Land and Land Development Costs | $ 5,672,900,000 |  | $ 5,172,400,000
Immediate Family Member of Management or Principal Owner [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Due from (to) Related Party | $ 77,500,000 |  |
Area of Land | a | 119 |  |
Mortgage Loans on Real Estate, Interest Rate | 2.55% |  |
Inventory, Real Estate, Land and Land Development Costs | $ 77,500,000 |  |
Land under Purchase Options, Recorded | $ 77,500,000 |  |
Related Party Transaction, Rate | 16.00% |  |
Forestar Group [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Inventory, Real Estate, Land and Land Development Costs | $ 803,000,000 |  | $ 463,100,000
Forestar Group [Member] | Senior Note Member Forty One [Member] | Subsequent Event [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 8.50% |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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