Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Basis of presentation (Textuals) [Abstract]
Number of housing construction markets	71		71
Number of housing construction states	26		26
Reclassification of depreciation expense	$ 0	$ 0.3	$ 0	$ 0.9