Commitments and Contingencies (Details Textual) (USD $)	Jul. 31, 2012
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	$ 78,800,000
Commitments and Contingencies (Textual) [Abstract]
Outstanding surety bonds	365,400,000
Amount of work remains on improvements in the Company's various communities	221,400,000
Additional outstanding surety bonds	55,400,000
Number of homes to be delivered	2,559
Aggregate sales value of outstanding homes to be delivered	1,600,000,000
Collateralized under credit facility [Member]
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	65,800,000
Collateralized by restricted cash [Member]
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	$ 13,000,000