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v3.20.4

Segment Information - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Segments Home Market State Projects OperatingDivisions | Dec. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) Home
Segment Reporting Information [Line Items] |  |  |
Gain (Loss) on Sale of Properties | $ 14.0 | $ 31.1 |
Total assets | 19,780.4 |  | $ 18,912.3
Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gain (Loss) on Sale of Properties | 0.9 | 31.2 |
Total assets | $ 438.7 |  | 379.4
Home Building [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of housing construction markets | Market | 90 |  |
Number of housing construction states | State | 29 |  |
Number of home building operating divisions | OperatingDivisions | 55 |  |
Number of homebuilding reporting segments | Segments | 6 |  |
Gain (Loss) on Sale of Properties | $ 13.1 | 0.0 |
Total assets | $ 16,065.5 |  | 15,221.4
Forestar Group [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of housing construction markets | Market | 51 |  |
Number of housing construction states | State | 21 |  |
Gain (Loss) on Sale of Properties | $ 0.0 | $ (0.1) |
Total assets | 1,809.1 |  | 1,739.9
Single Family [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Gross | 106.6 |  | 87.2
Multifamily [Member] | Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 294.3 |  | 246.2
Multi-Family Units, Total | Home | 2,325 |  |
Multi-Family Units, Under Active Construction | Home | 1,015 |  |
Multi-Family Units, Completed | Home | 1,310 |  |
Single Family [Member] | Home Building [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Unit Sales, Single-Family | Home | 124 |  |
Home sales | $ 31.8 |  |
Property, Plant and Equipment, Gross | $ 106.6 |  | $ 87.2
Single Family Rental Units, Completed Homes | Home | 440 |  | 440
Single Family Rental Units, Homes and Lots, Total | Home | 890 |  | 740
Asset under Construction [Member] | Multifamily [Member] | Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of Projects | Projects | 4 |  |
Assets Leased to Others [Member] | Single Family [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Gross | $ 89.3 |  | $ 68.1
Assets Leased to Others [Member] | Multifamily [Member] | Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of Projects | Projects | 4 |  |

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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=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: 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=120311839&loc=d3e8736-108599 Reference 8: 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=120400017&loc=d3e572229-122910 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
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