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Capitalized Interest (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Rollforward of capitalized interest
Capitalized interest, beginning of period	$ 237.4	$ 217.7
Interest incurred	46.2	36.9
Interest charged to cost of sales	(28.5)	(33.3)
Capitalized interest, end of period	255.1	221.3
Financial Services [Member]
Rollforward of capitalized interest
Interest incurred	8.1	4.0
Forestar Group [Member]
Rollforward of capitalized interest
Interest incurred	8.2	$ 8.1
Rental
Rollforward of capitalized interest
Interest incurred	$ 9.0

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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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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