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v3.21.1

Segment Information - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) Segments Market Home OperatingDivisions Projects State | Mar. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) Market Home Projects State | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) Home
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (Loss) on Sale of Properties | $ 0.0 | $ 28.5 | $ 14.0 | $ 59.5 |
Total assets | 21,083.8 |  | 21,083.8 |  | $ 18,912.3
Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (Loss) on Sale of Properties |  | 28.2 | 0.9 | 59.4 |
Total assets | $ 547.5 |  | $ 547.5 |  | 379.4
Forestar Group [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of housing construction markets | Market | 54 |  | 54 |  |
Number of housing construction states | State | 22 |  | 22 |  |
Gain (Loss) on Sale of Properties |  | 0.3 | $ 0.0 | 0.1 |
Total assets | $ 1,898.9 |  | $ 1,898.9 |  | 1,739.9
HomeBuildingMember |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of housing construction markets | Market | 91 |  | 91 |  |
Number of housing construction states | State | 29 |  | 29 |  |
Number of home building operating divisions | OperatingDivisions | 55 |  |  |  |
Number of homebuilding reporting segments | Segments | 6 |  |  |  |
Gain (Loss) on Sale of Properties |  | $ 0.0 | $ 13.1 | $ 0.0 |
Total assets | $ 16,783.9 |  | 16,783.9 |  | 15,221.4
Multifamily [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | $ 394.4 |  | $ 394.4 |  | 246.2
Multi-Family Units, Total | Home | 3,760 |  | 3,760 |  |
Multi-Family Units, Under Active Construction | Home | 2,450 |  | 2,450 |  |
Multi-Family Units, Completed | Home | 1,310 |  | 1,310 |  |
Single Family [Member] | HomeBuildingMember |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Unit Sales, Single-Family | Home |  |  | 124 |  |
Home sales |  |  | $ 31.8 |  |
Property, Plant and Equipment, Gross | $ 182.6 |  | $ 182.6 |  | $ 87.2
Single Family Rental Units, Completed Homes | Home | 570 |  | 570 |  | 440
Single Family Rental Units, Homes and Lots, Total | Home | 1,650 |  | 1,650 |  | 740
Asset under Construction [Member] | Multifamily [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Projects | Projects | 8 |  | 8 |  |
Property, Plant and Equipment, Other Types | Multifamily [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Projects | Projects | 4 |  | 4 |  |

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