Summary of Significant Accounting Policies (Details Textuals 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Revenue Recognition [Abstract]
Deferred profit on sales	$ 2.3		$ 1.3
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	236.7		195.4
Property, Plant and Equipment, Net	109.5	[1]	73.8	[1]
Accumulated depreciation	(127.2)		(121.6)
Depreciation	22.3		18.8		19.9
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Sale and Maturity of Available-for-sale Securities	325.4		232.8		292.5
Model home furniture [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	72.7		60.8
Property, Plant and Equipment, Useful Life	2 years
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	92.2		77.0
Buildings and improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Buildings and improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Office furniture [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	54.9		42.7
Office furniture [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Office furniture [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	16.9		14.9
Homebuilding [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	106.7		72.6
Financial Services [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	$ 2.8		$ 1.2

[1] Includes $2.8 million and $1.2 million at September 30, 2013 and 2012, respectively, of property and equipment related to the Company's financial services subsidiaries which is included in financial services other assets on the consolidated balance sheets.