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Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Inventory [Line Items] |  |  |  |  |
Carrying value of communities with impairment indicators | $ 63.1 |  |  | $ 63.1 |
Impairment charges | 6.8 | $ 3.9 |  | 18.6 | $ 8.3
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs | $ 12.4 | $ 5.0 |  | $ 22.4 | 10.0
Payments for Legal Settlements |  |  |  |  | 24.5
Forestar Group [Member] |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Proceeds from Sale of Productive Assets |  |  | $ 232.0 |  |
Payments for (Proceeds from) Productive Assets |  |  | $ (217.5) |  |
Gain (Loss) on Sale of Interest in Projects |  |  |  |  | $ 0.7

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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 Gain (loss) included in earnings resulting from the sale of interest in projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + 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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