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Property, Plant, and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Property and Equipment [Line Items]
Property, Plant and Equipment, Net	$ 471.6	$ 392.9
Depreciation	72.0	73.3	$ 69.4
Home Building
Property and Equipment [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(289.2)	(276.6)
Property, Plant and Equipment, Net	361.8	303.3
Other Segments [Member]
Property and Equipment [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(40.7)	(28.4)
Property, Plant and Equipment, Net	97.8	82.6
Forestar Group [Member]
Property and Equipment [Line Items]
Property, Plant and Equipment, Net	5.7	2.9
Financial Services [Member]
Property and Equipment [Line Items]
Property, Plant and Equipment, Net	4.3	3.5
Rental
Property and Equipment [Line Items]
Property, Plant and Equipment, Net	2.0	0.6
Building and Building Improvements [Member] | Home Building
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	349.6	299.5
2510 Household Furniture [Member] | Home Building
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	133.4	134.1
Furniture and Fixtures | Home Building
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	132.5	113.7
Furniture and Fixtures | Other Segments [Member]
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	16.2	15.9
Land [Member] | Home Building
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	35.5	32.6
Land [Member] | Other Segments [Member]
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	16.1	16.1
Other Assets | Other Segments [Member]
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 106.2	$ 79.0

X

- 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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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