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Inventory (Details) - Homebuilding [Member] - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Inventory Impairments Information [Line Items] |  |  |  |
Carrying value of communities with impairment indicators | $ 105.3 | $ 105.3 |  |
Impairment charges | $ 12.8 | 23.2 | $ 20.3 | $ 44.9
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs |  | $ 17.0 | $ 11.1 | $ 15.4

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- Definition The net write-off or recovery of earnest money deposits and pre-acquisition costs related to land option contracts during the period. + References No definition available. + Details
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