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Segment Information - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) Projects Market State Segments OperatingDivisions | Sep. 30, 2017 USD ($)
Homebuilding [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of housing construction markets | Market | 80 |
Number of housing construction states | State | 26 |
Number of home building operating divisions | OperatingDivisions | 44 |
Number of homebuilding reporting segments | Segments | 6 |
Forestar Group [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of housing construction markets | Market | 20 |
Number of housing construction states | State | 11 |
Multifamily [Member] | Other Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Property, Plant and Equipment, Gross | $ | $ 152.0 | $ 93.7
Asset under Construction [Member] | Multifamily [Member] | Other Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Projects | Projects | 5 |
Assets Leased to Others [Member] | Multifamily [Member] | Other Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Projects | Projects | 1 |

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- Definition The number of markets the entity operates in as of the balance sheet date. + References No definition available. + Details
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- Definition Number of Projects + References No definition available. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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