Commitments and Contingencies (Details Textual) (USD $)	Jul. 31, 2014
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	$ 97,700,000
Commitments and Contingencies (Textual) [Abstract]
Number of lots to be acquired from joint venture	3,750
Funding Commitments	82,962,000
Purchase commitments to acquire land for apartment development	64,300,000
Deposits on purchase commitment to acquire land for apartment development	4,289,000
Outstanding surety bonds	585,300,000
Amount of work remains on improvements in the Company's various communities	385,200,000
Additional outstanding surety bonds	76,400,000
Number of homes to be delivered	4,204
Aggregate sales value of outstanding homes to be delivered	3,100,000,000
Development Joint Venture (five) [Member]
Commitments and Contingencies (Textual) [Abstract]
Number of lots acquired from joint venture	515
Funding Commitments	19,300,000
Revolving Credit Facility [Member]
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	94,700,000
Collateralized by restricted cash [Member]
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	$ 3,000,000