Commitments and Contingencies (Details Textual) (USD $)	Jan. 31, 2012 Homes
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	$ 83,500,000
Commitments and Contingencies (Textual) [Abstract]
Outstanding surety bonds	367,100,000
Amount of work remains on improvements in the Company's various communities	206,600,000
Additional outstanding surety bonds	65,700,000
Outstanding letter of credit collateralized by restricted cash	13,300,000
Number of homes to be delivered	1,784
Aggregate sales value of outstanding homes to be delivered	1,100,000,000
New credit facility [Member]
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	$ 70,200,000