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Inventory (Details) - Homebuilding [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Inventory [Line Items]        
Carrying value of communities with impairment indicators $ 75.0   $ 75.0  
Impairment charges 1.0 $ 5.2 10.4 $ 8.9
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs $ 4.4 $ 2.9 $ 9.5 $ 7.1