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Property and Equipment, Net (Tables)
 12 Months Ended
Jul. 31, 2013
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment
 
 
     Years Ended July 31,    
     2013    2012
Transportation and other equipment
               $ 58,016          $ 52,066   
Office furniture and equipment
                  59,936             53,363   
Software
                  74,261             54,399   
Land
                  443,126             350,463   
Buildings and leasehold improvements
                  414,284             400,302   
 
                  1,049,623             910,593   
Less accumulated depreciation and amortization
                  (372,106 )            (323,430 )  
 
               $ 677,517          $ 587,163