Quarterly Results of Operations (Unaudited) (Details Textuals) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended				12 Months Ended
	Apr. 02, 2012	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2013 Homebuilding [Member]	Sep. 30, 2012 Homebuilding [Member]	Sep. 30, 2011 Homebuilding [Member]
Inventory Impairments Information [Line Items]
Inventory impairments and land option charges		$ 27.1				$ 31.1	$ 6.2	$ 45.4
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 753.2	$ 2.9	$ 18.7	$ 36.5	$ 716.7