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Concentration of Credit Risk (Tables)
 3 Months Ended
Oct. 24, 2015
Risks and Uncertainties [Abstract]  
Schedule that Represents A Significant Portion of the Company’s Customer Base and Each Over 10% of Total Revenue
Customers whose revenues exceeded 10% of total revenue during the three months ended October 24, 2015 or October 25, 2014 were as follows:

 
For the Three Months Ended
 
October 24, 2015
 
October 25, 2014
AT&T Inc.
19.1%
 
21.2%
CenturyLink, Inc.
15.6%
 
13.1%
Comcast Corporation
12.0%
 
12.8%