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Inventory (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Inventory [Line Items]          
Carrying value of communities with impairment indicators $ 63.1     $ 63.1  
Impairment charges 6.8 $ 3.9   18.6 $ 8.3
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs $ 12.4 $ 5.0   $ 22.4 10.0
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 (Loss) on Sale of Interest in Projects         $ 0.7