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Income Taxes - Textual (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Effective tax rate | 20.20% | 23.80% | 29.00%
Federal statutory rate | 21.00% | 21.00% | 35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ 0.0 | $ 0.0 | $ 108.7
Deferred Tax Assets, Valuation Allowance | 7.5 | 18.7 |
Net operating loss carryforwards | 17.5 | 31.5 |
Effective Income Tax Rate Reconciliation, Tax Credit, Amount | 93.4 | $ 1.6 | $ 19.0
Forestar Consolidated [Member] | State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 1.7 |  |
Home Building [Member] | State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 15.8 |  |
Home Building [Member] | State [Member] | NOL Carryforwards to Expire in One to Ten Years [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards, subject to expiration | 5.4 |  |
Home Building [Member] | State [Member] | NOL Carryforward to Expire in Eleven to Twenty Years [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards, subject to expiration | $ 10.4 |  |
Weighted Average [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Federal statutory rate |  |  | 24.50%

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