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Inventory (Details Textual) (USD $)
In Millions, unless otherwise specified
Jul. 31, 2013
contracts
Jul. 31, 2012
Inventory (Textual) [Abstract]    
Number of VIE Land Purchase Contracts (in ones) 85  
Aggregate purchase price of VIE lands $ 1,117.8  
Deposits for purchase of lands with VIE entities 43.3  
Reduction in Capitalized Interest $ 40.5 $ 50.6