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Inventory (Details) - Homebuilding [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Inventory [Line Items] |  |  |  |
Carrying value of communities with impairment indicators | $ 201.9 |  | $ 201.9 |
Impairment charges | 5.2 | $ 11.7 | 8.9 | $ 23.6
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs | $ 2.9 | $ 3.7 | $ 7.1 | $ 10.4

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