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v3.19.1

Segment Information - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) Projects Market State Segments OperatingDivisions | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) Projects Market State | Mar. 31, 2018 USD ($) | Sep. 30, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Proceeds from Sale of Buildings |  |  | $ 83.8 | $ 253.4 |
Gain (Loss) on Sale of Properties | $ 29.3 | $ 1.1 | 31.3 | 14.5 |
Total assets | 15,007.0 |  | 15,007.0 |  | $ 14,114.6
Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (Loss) on Sale of Properties | 29.3 | 0.0 | 29.3 | 0.0 |
Total assets | $ 263.3 |  | $ 263.3 |  | 198.9
Homebuilding [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of housing construction markets | Market | 84 |  | 84 |  |
Number of housing construction states | State | 29 |  | 29 |  |
Number of home building operating divisions | OperatingDivisions | 51 |  |  |  |
Number of homebuilding reporting segments | Segments | 6 |  |  |  |
Gain (Loss) on Sale of Properties | $ 0.0 | 0.0 | $ 2.0 | 13.4 |
Total assets | $ 12,885.8 |  | $ 12,885.8 |  | 12,132.8
Forestar Group [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of housing construction markets | Market | 41 |  | 41 |  |
Number of housing construction states | State | 17 |  | 17 |  |
Gain (Loss) on Sale of Properties | $ 0.0 | $ 2.7 | $ 0.9 | $ 2.7 |
Total assets | 984.9 |  | 984.9 |  | 893.1
Multifamily [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Proceeds from Sale of Buildings | 73.4 |  | 73.4 |  |
Gain (Loss) on Sale of Properties | 29.3 |  | 29.3 |  |
Total assets | $ 170.2 |  | $ 170.2 |  | $ 173.2
Asset under Construction [Member] | Multifamily [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Projects | Projects | 4 |  | 4 |  |
Assets Leased to Others [Member] | Multifamily [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Projects | Projects | 2 |  | 2 |  |

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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://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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