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Inventory (Details Textual) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2014
contracts
Jan. 31, 2013
Inventory (Textual) [Abstract]    
Number of VIE Land Purchase Contracts (in ones) 86  
Aggregate purchase price of VIE lands $ 865.2  
Deposits for purchase of lands with VIE entities 47.6  
Reduction in Capitalized Interest $ 37.1 $ 46.2