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Description of Business and Summary of Significant Accounting Policies (Details Textual)
$ in Millions
 12 Months Ended
Jul. 31, 2015
USD ($)
Customer
Segment
Jul. 31, 2014
USD ($)
Customer
Jul. 31, 2013
USD ($)
Customer
Description Of Business And Significant Accounting Policies (Textual)      
Investments accounted for using the equity method $ 9.0 $ 9.4  
Investments accounted for using the cost method 3.4 1.8  
Advertising expense 16.5 17.2 $ 13.1
Amortization expense related to capitalized software 11.4 8.8 $ 7.3
Unamortized capitalized internal use software costs $ 18.8 $ 15.1  
Number of reportable segments | Segment 2    
Revenue [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Concentration risk, percentage 11.20% 12.00% 10.00%
Number of customers | Customer 5 5 5
Receivable [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Concentration risk, percentage 24.10% 22.10%  
Number of customers | Customer 5 5  
Technology and domain names [Member] | Maximum [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Amortization period 4 years    
Technology and domain names [Member] | Minimum [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Amortization period 3 years    
Customer Lists [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Amortization period 15 years    
Trademarks [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Amortization period 5 years    
Equipment [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of Long-Lived assets 7 years    
Equipment [Member] | Maximum [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of Long-Lived assets 20 years    
Equipment [Member] | Minimum [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of Long-Lived assets 5 years    
Building [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of Long-Lived assets 40 years    
Computer Software [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of Long-Lived assets 3 years    
Computer Software [Member] | Maximum [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of Long-Lived assets 5 years    
Computer Software [Member] | Minimum [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of Long-Lived assets 2 years    
Furniture and Fixtures [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of Long-Lived assets 7 years    
Furniture and Fixtures [Member] | Maximum [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of Long-Lived assets 10 years    
Furniture and Fixtures [Member] | Minimum [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of Long-Lived assets 5 years    
Internal-use Software [Member]      
Description Of Business And Significant Accounting Policies (Textual)      
Estimated useful lives of internal-use software Excess of one year.