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Accounting Policies (Details) - USD ($) $ in Millions			12 Months Ended
	Sep. 30, 2024	Oct. 31, 2017	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Business Information [Line Items]
Land purchase contract deposits	$ 23.4		$ 23.4	$ 7.0
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			4 years 6 months
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	10.9		$ 10.9	8.6
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(3.8)		(3.8)	(2.7)
Property and equipment, net	7.1		7.1	5.9
Depreciation			1.1	1.0	$ 0.7
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1.8		1.8	1.6
Property, Plant and Equipment, Other Types [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 9.1		$ 9.1	$ 7.0
Minimum | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years		5 years
Minimum | Property, Plant and Equipment, Other Types [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years		2 years
Maximum | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years		10 years
Maximum | Property, Plant and Equipment, Other Types [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years		10 years
D.R. Horton, Inc. [Member] | Majority Shareholder [Member]
Business Information [Line Items]
Sale of Stock, Percentage of Ownership after Transaction	62.00%	75.00%

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