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v3.20.1

Segment Information - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) OperatingDivisions Segments Market State Projects | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) Market State Projects | Mar. 31, 2019 USD ($) | Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Proceeds from Sale of Buildings |  |  |  | $ 129.8 | $ 83.8 |
Gain (Loss) on Sale of Properties | $ 28.5 |  | $ 29.3 | 59.5 | 31.3 |
Total assets | 17,130.0 |  |  | 17,130.0 |  | $ 15,606.6
Other Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (Loss) on Sale of Properties | 28.2 |  | 29.3 | 59.4 | 29.3 |
Total assets | $ 333.4 |  |  | $ 333.4 |  | 317.9
Home Building [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of housing construction markets | Market | 89 |  |  | 89 |  |
Number of housing construction states | State | 29 |  |  | 29 |  |
Number of home building operating divisions | OperatingDivisions | 52 |  |  |  |  |
Number of homebuilding reporting segments | Segments | 6 |  |  |  |  |
Gain (Loss) on Sale of Properties | $ 0.0 |  | 0.0 | $ 0.0 | 2.0 |
Total assets | $ 13,598.5 |  |  | $ 13,598.5 |  | 12,715.9
Forestar Group [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of housing construction markets | Market | 50 |  |  | 50 |  |
Number of housing construction states | State | 21 |  |  | 21 |  |
Gain (Loss) on Sale of Properties | $ 0.3 |  | $ 0.0 | $ 0.1 | $ 0.9 |
Total assets | 1,675.6 |  |  | 1,675.6 |  | 1,455.7
Multifamily [Member] | Other Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Proceeds from Sale of Buildings | 67.0 | $ 61.5 |  |  |  |
Gain (Loss) on Sale of Properties | 28.2 | $ 31.2 |  |  |  |
Total assets | $ 202.8 |  |  | $ 202.8 |  | $ 204.0
Asset under Construction [Member] | Multifamily [Member] | Other Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of Projects | Projects | 3 |  |  | 3 |  |
Assets Leased to Others [Member] | Multifamily [Member] | Other Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of Projects | Projects | 1 |  |  | 1 |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: 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)(12)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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