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Capitalized Interest Capitalized Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest, beginning of year	$ 355.1	$ 286.4	$ 237.4
Interest incurred	241.7	203.7	203.5
Charged to cost of sales	(158.1)	(135.0)	(154.5)
Capitalized interest, end of year	438.7	355.1	286.4
Financial Services [Member]
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Interest incurred	33.9	58.6	45.9
Forestar Group [Member]
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Interest incurred	45.5	32.7	32.8
Rental
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Interest incurred	$ 59.2	$ 61.9	$ 56.0

X

- Definition

Total interest costs incurred during the period and either capitalized or charged against earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483013/835-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483013/835-20-50-1

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of interest costs that were capitalized to properties under development during the land development and construction period of a project, and which are included in inventory.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483013/835-20-50-1

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of interest cost charged to cost of sales that had been previously capitalized to inventory.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483013/835-20-50-1

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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