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Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Inventory [Line Items] |  |  |  |
Impairment charges | $ 0.0 | $ 0.0 | $ 5.6 | $ 1.7
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs | $ 5.6 | $ 5.0 | $ 12.0 | $ 16.1

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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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