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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

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- Definition Inventory Impairments and Land Option Cost Write-Offs. + References No definition available. + Details
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- 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 + Details
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- 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 + Details
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