Income Taxes - Textual (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Operating Loss Carryforwards [Line Items]
Effective tax rate	23.50%	24.10%	22.70%
Federal statutory rate	21.00%	21.00%	21.00%
Net operating loss carryforwards	$ 38.9	$ 42.2
Deferred Tax Assets, Valuation Allowance	14.9	$ 14.8
Home Building | State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	10.9
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	5.2
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	5.7
Forestar Group [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 0.9