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Inventory (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Inventory Impairments Information [Line Items]        
Impairment charges $ 7.1 $ 25.7 $ 11.8 $ 23.2
Payments for Legal Settlements     24.5  
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs   28.3 14.1 $ 17.0
Home Building [Member]        
Inventory Impairments Information [Line Items]        
Carrying value of communities with impairment indicators $ 55.9 $ 55.9    
Forestar Group [Member]        
Inventory Impairments Information [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