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Inventory (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Inventory Impairments and Land Option Cost Write-Offs [Abstract]
Carrying Value of Communities Impaired	$ 74.8	$ 74.8
Inventory Write-down	$ 8.5	33.0	$ 14.0	$ 19.0
Loss on Contract Termination		$ 125.1	$ 64.8	$ 61.3

X

- Definition

Carrying Value of Communities Impaired

+ References

No definition available.

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X

- Definition

Inventory Impairments and Land Option Cost Write-Offs.

+ References

No definition available.

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X

- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 330
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483080/330-10-50-2

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X

- Definition

The loss recognized on termination of a contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 912
-SubTopic 275
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479072/912-275-50-4

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