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Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Inventory [Line Items] |  |  |  |
Carrying value of communities with impairment indicators | $ 47.6 |  | $ 47.6 |
Impairment charges | 1.7 | $ 7.7 | 1.7 | $ 11.9
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs | $ 7.2 | $ 6.1 | $ 11.1 | $ 9.9

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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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