Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Homebuilding [Member]	Dec. 31, 2013 Homebuilding [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Sep. 30, 2013 Homebuilding [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Dec. 31, 2013 RegentHomes [Member]	Oct. 31, 2013 RegentHomes [Member] Home Lot
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 34.5	$ 9.4				$ 34.5
Business Acquisition, Number of Homes Acquired							240
Business Acquisition, Number of Finished Lots Acquired							300
Business Acquisition, Number of Lots Under Option Contracts							600
Business Acquisition, Sales Order Backlog Acquired (Homes)							213
Business Information [Line Items]
Earnest Money Deposits			$ 43.8	$ 38.9	$ 36.9