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Inventory (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Inventory Impairments Information [Line Items]
Impairment charges	$ 3.5		$ 11.8	$ 23.2	$ 20.3
Inventory and land option charges			50.4	40.2	31.4
Payments for Legal Settlements			24.5
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs			14.1	17.0	11.1
Homebuilding [Member]
Inventory Impairments Information [Line Items]
Carrying value of communities with impairment indicators	$ 60.5		60.5
Inventory and land option charges			48.8	$ 40.2	$ 31.4
Forestar Group [Member]
Inventory Impairments Information [Line Items]
Inventory and land option charges			1.0
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 aggregate carrying value of communities with impairment indicators as determined through the entity's impairment analysis.

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Inventory Impairments Information.

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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.

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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
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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.

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The amount of cash paid for the settlement of litigation or for other legal issues during the period.

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The net cash outflow or inflow from purchases, sales and disposals of property, plant and equipment and other productive assets, including intangibles.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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Nonrecurring impairment charges related to the write-off of production-related equipment and inventory. This tag is used when an Entity charges this cost to cost of goods sold.

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