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Property and Equipment, Net (Tables)
12 Months Ended
Jul. 31, 2012
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment
     July 31,   
     2012   2011
Transportation and other equipment
              $ 52,066          $ 65,009   
Office furniture and equipment
                 53,363             53,411   
Software
                 54,399             46,761   
Land
                 350,463             343,170   
Buildings and leasehold improvements
                 400,302             384,366   
 
                 910,593             892,717   
Less accumulated depreciation and amortization
                 (323,430 )            (292,329 )  
 
              $ 587,163          $ 600,388