Commitments and Contingencies (Details Textual) (USD $)	Apr. 30, 2014
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	$ 93,800,000
Commitments and Contingencies (Textual) [Abstract]
Number of lots to be acquired from joint venture	3,800
Purchase commitments to acquire land for apartment development	56,000,000
Deposits on purchase commitment to acquire land for apartment development	3,600,000
Outstanding surety bonds	560,300,000
Amount of work remains on improvements in the Company's various communities	377,400,000
Additional outstanding surety bonds	71,800,000
Number of homes to be delivered	4,324
Aggregate sales value of outstanding homes to be delivered	3,210,000,000
Collateralized under credit facility [Member]
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	90,800,000
Collateralized by restricted cash [Member]
Commitments and Contingencies (Additional Textual) [Abstract]
Outstanding letter of credit	$ 3,000,000
Development Joint Venture (five) [Member]
Commitments and Contingencies (Textual) [Abstract]
Number of lots to be acquired from joint venture	935