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Property, Plant, and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Property and Equipment [Line Items]
Property, Plant and Equipment, Net	$ 578.9	$ 531.0
Depreciation	90.9	78.5	$ 82.9
Home Building
Property and Equipment [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(365.9)	(323.0)
Property, Plant and Equipment, Net	543.0	500.2
Rental
Property and Equipment [Line Items]
Property, Plant and Equipment, Net	0.6	1.1
Forestar Group [Member]
Property and Equipment [Line Items]
Property, Plant and Equipment, Net	8.1	7.1
Financial Services [Member]
Property and Equipment [Line Items]
Property, Plant and Equipment, Net	4.3	4.0
Eliminations and Other
Property and Equipment [Line Items]
Property, Plant and Equipment, Net	22.9	18.6
Building and Building Improvements [Member] | Home Building
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	524.4	483.2
2510 Household Furniture [Member] | Home Building
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	189.8	171.2
Furniture and Fixtures | Home Building
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	135.5	111.1
Land [Member] | Home Building
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 59.2	$ 57.7

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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