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Income Taxes - Textual (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Operating Loss Carryforwards [Line Items]
Effective tax rate		23.80%	29.00%	35.20%
Federal statutory rate		21.00%		35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 108.7	$ 0.0	$ 108.7	$ 0.0
Valuation allowance		18.7	17.7
Net operating loss carryforwards		31.5	$ 38.1
Forestar Consolidated [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		3.7
Forestar Consolidated [Member] | Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		11.4
Home Building [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		16.4
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		6.2
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		$ 10.2
Weighted Average [Member]
Operating Loss Carryforwards [Line Items]
Federal statutory rate			24.50%

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