Summary of Significant Accounting Policies (Details) [Textuals] (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Summary of Significant Accounting Policies (Textuals) [Abstract]
Reclassification of depreciation expense		$ 1.2
Deferred profit on sales	1.5	2.0
Cash equivalents, defined	3 months or less
Deposits on land option contracts	13.2	10.2
Accumulated depreciation	129.2	150.8
Depreciation	19.9	18.4	25.7
Goodwill impaired accumulated impairment loss	553.5	553.5
Remaining goodwill balance	15.9	15.9
Limited warranty on major mechanical systems	2 years
Limited warranty for major defects in structural components and foundation systems	10 years
Limited warranty on other construction components	1 year
Advertising expense	$ 29.5	$ 39.3	$ 31.7
Model Home Furniture [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives, maximum	2
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives, minimum	5
Depreciable lives, maximum	20
Office Furniture [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives, minimum	2
Depreciable lives, maximum	5