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Property and Equipment, Net (Tables)
12 Months Ended
Jul. 31, 2011
Property, Plant and Equipment [Abstract] 
Property and equipment
     July 31,
   
     2011
   2010
Transportation and other equipment
              $ 65,009          $ 61,245   
Office furniture and equipment
                 53,411             43,307   
Software
                 46,761             22,915   
Land
                 343,170             306,251   
Buildings and leasehold improvements
                 384,366             399,350   
 
                 892,717             833,068   
Less accumulated depreciation and amortization
                 (292,329 )            (259,554 )  
 
              $ 600,388          $ 573,514