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Summary of Significant Accounting Policies (Details Textuals 2) (USD $)
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Retained Insurance Liabilities [Abstract]      
Amount deductible per claim - insurance policies $ 250,000    
Amount deductible per claim - medical policy 225,000    
Self insured claims reserve 6,100,000 5,700,000  
Share-based Arrangements with Employees and Nonemployees [Abstract]      
Proceeds from the exercise of stock options 21,442,000 13,651,000 7,082,000
Income tax benefit realized from stock-based payment compensation 6,097,000 4,367,000 3,547,000
Impairment of long-lived assets   $ 8,771,000  
Leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Property and Equipment, estimated useful lives between 5 and 10 years    
Internally developed or purchased software
      
Property, Plant and Equipment [Line Items]      
Property and Equipment, estimated useful lives 3 to 5 years    
Transportation and other equipment
      
Property, Plant and Equipment [Line Items]      
Property and Equipment, estimated useful lives 3 to 7 years    
Office furniture and equipment
      
Property, Plant and Equipment [Line Items]      
Property and Equipment, estimated useful lives 3 to 10 years    
Buildings and leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Property and Equipment, estimated useful lives 15 to 40 years or the lease term, whichever is shorter