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Income Taxes - Textual (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Apr. 30, 2022
Operating Loss Carryforwards [Line Items] |  |  |  |
Effective tax rate | 22.70% | 21.80% | 20.20% |
Federal statutory rate | 21.00% | 21.00% | 21.00% |
Net operating loss carryforwards | $ 44.1 | $ 11.7 |  |
Deferred Tax Assets, Valuation Allowance | 17.9 | $ 4.2 |  |
Vidler Water Resources, Inc. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 30.9 |  |  |
Business acquisition, deferred income tax valuation allowance acquired |  |  |  | $ 15.8
Home Building | State [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 12.0 |  |  |
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 | 4.3 |  |  |
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 | 7.7 |  |  |
Forestar Group [Member] | State [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | $ 1.2 |  |  |

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