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Inventory Impairments and Land Option Cost Write-Offs (Details) (Homebuilding [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Sep. 30, 2012
Homebuilding [Member]
         
Inventory Impairments and Land Option Cost Write Offs [Abstract]          
Carrying value of communities with impairment indicators $ 177.1   $ 177.1    
Carrying value of communities impaired 0   0    
Impairment charges 0 1.9 0 2.6  
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs 0.8 0.6 4.0 2.1  
Land held for sale $ 22.0   $ 22.0   $ 32.6