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Income Taxes - Textual (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Operating Loss Carryforwards [Line Items] |  |  |
Effective tax rate | 21.80% | 20.20% | 23.80%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent | 2.20% | 3.10% |
Federal statutory rate | 21.00% | 21.00% | 21.00%
Net operating loss carryforwards | $ 11.7 | $ 17.5 |
Deferred Tax Assets, Valuation Allowance | 4.2 | $ 7.5 |
Forestar Consolidated [Member] | State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 1.4 |  |
Home Building | State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 10.3 |  |
Home Building | State [Member] | NOL Carryforwards to Expire in One to Ten Years [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards, subject to expiration | 2.9 |  |
Home Building | State [Member] | NOL Carryforward to Expire in Eleven to Twenty Years [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards, subject to expiration | $ 7.4 |  |

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