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Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Homebuilding [Member] |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Carrying value of communities with impairment indicators | $ 65.3 |  |  | $ 65.3 |
Impairment charges | 3.9 |  | $ 1.0 | 8.3 | $ 10.4
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs | $ 5.0 |  | $ 4.4 | 10.0 | $ 9.5
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 on sale of assets |  |  |  | $ 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84176398&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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66092785&loc=d3e4542-108314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 1C -URI http://asc.fasb.org/extlink&oid=68049868&loc=SL66093883-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=68049868&loc=SL66093879-108312 + Details
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