Capitalized Interest Capitalized Interest (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2010
Capitalized Interest [Line Items]
Interest Costs Incurred	$ 172.8	[1]	$ 124.1	[1]	$ 131.6	[1]
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Real Estate Inventory, Capitalized Interest Costs	137.1		82.3		79.2		91.5
Interest Expense	(7.1)		(26.9)		(51.9)
Real Estate Inventory, Capitalized Interest Costs, Cost of Sales	(110.2)		(94.0)		(90.8)
Capitalized Interest Costs Written Off With Inventory Impairments	(0.7)		(0.1)		(1.2)
Financial Services [Member]
Capitalized Interest [Line Items]
Interest Costs Incurred	$ 4.6		$ 3.3		$ 1.4

[1] Interest incurred includes interest incurred on the Company's financial services mortgage repurchase facility of $4.6 million, $3.3 million and $1.4 million in fiscal 2013, 2012 and 2011, respectively.