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Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Inventory Impairments and Land Option Cost Write-Offs [Abstract] |  |  |  |
Inventory Write-down | $ 0.0 | $ 5.6 | $ 1.7 | $ 25.7
Write Offs Recoveries Of Earnest Money Deposits And Pre-Acquisition Costs |  | $ 23.0 | $ 22.1 | $ 28.3

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- Definition Inventory Impairments and Land Option Cost Write-Offs. + References No definition available. + Details
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- Definition The net write-off or recovery of earnest money deposits and pre-acquisition costs related to land option contracts during the period. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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