Inventory (Details Textual) (USD $)	3 Months Ended	6 Months Ended
	Jan. 31, 2011	Apr. 30, 2012	Apr. 30, 2011
Inventory (Textual) [Abstract]
Reclassification of inventory to property, construction and office equipment	$ 20,000,000		$ 20,005,000
Aggregate purchase price of lands		484,400,000
Deposits for purchase of lands with VIE entities		24,200,000
Number of VIE Land Purchase Contracts		56
Reduction in Capitalized Interest		$ 52,800,000	$ 54,500,000