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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Continuing operations
Net income (loss) attributable to Forestar Group Inc.	$ 28.4	$ 9.6	$ 50.4	$ 26.4
Denominator:
Weighted average common shares outstanding — basic	48,412,213	48,025,359	48,270,718	48,018,246
Dilutive effect of stock-based compensation	97,711	57,592	80,692	56,439
Total weighted average shares outstanding — diluted	48,509,924	48,082,951	48,351,410	48,074,685
Earnings Per Share, Basic	$ 0.59	$ 0.20	$ 1.04	$ 0.55
Earnings Per Share, Diluted	$ 0.59	$ 0.20	$ 1.04	$ 0.55

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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