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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income attributable to Forestar Group Inc. $ 44.0 $ 15.8 $ 28.4 $ 22.0 $ 24.2 $ 10.1 $ 9.6 $ 16.9 $ 110.2 $ 60.8 $ 33.0
Weighted average number of common shares                 48,901,987 48,037,018 41,974,429
Dilutive effect of stock-based compensation                 73,674 57,093 30,712
Adjusted weighted average number of common shares                 48,975,661 48,094,111 42,005,141
Basic net income per common share attributable to Forestar Group Inc. $ 0.89 $ 0.32 $ 0.59 $ 0.46 $ 0.50 $ 0.21 $ 0.20 $ 0.35 $ 2.25 $ 1.26 $ 0.79
Diluted net income per common share attributable to Forestar Group Inc. $ 0.89 $ 0.32 $ 0.59 $ 0.46 $ 0.50 $ 0.21 $ 0.20 $ 0.35 $ 2.25 $ 1.26 $ 0.79