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Inventory (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Inventory Impairments Information [Line Items] |  |  |
Carrying value of communities with impairment indicators | $ 36.1 |  |
Impairment charges | 1.7 | $ 25.7 | $ 11.8
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs | $ 22.1 | $ 28.3 | 14.1
Payments for Legal Settlements |  |  | $ 24.5

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- Definition The aggregate carrying value of communities with impairment indicators as determined through the entity's impairment analysis. + 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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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
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