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Inventory (Details Textual) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2013
contracts
Apr. 30, 2012
Inventory (Textual) [Abstract]    
Number of VIE Land Purchase Contracts (in ones) 71  
Aggregate purchase price of VIE lands $ 908.5  
Deposits for purchase of lands with VIE entities 32.1  
Reduction in Capitalized Interest $ 43.4 $ 54.5