Inventory Impairments and Land Option Cost Write-Offs (Details) (Homebuilding [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Homebuilding [Member]
Inventory Impairments and Land Option Cost Write Offs [Abstract]
Carrying value of communities with impairment indicators	$ 136.1
Carrying value of communities impaired	0
Impairment charges	0	0
Write-offs (recoveries) of earnest money deposits and pre-acquisition costs	2.6	1.3
Land held for sale	$ 30.6		$ 34.0