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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

X

- Definition

The aggregate carrying value of communities with impairment indicators as determined through the entity's impairment analysis.

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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

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- Definition

Gain (loss) included in earnings resulting from the sale of interest in projects.

+ References

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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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