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Concentration of Credit Risk (Tables)
 12 Months Ended
Jul. 30, 2016
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 contract revenues exceeded 10% of total contract revenue during fiscal 2016, 2015, or 2014, were as follows:
 
Fiscal Year Ended
 
2016
 
2015
 
2014
AT&T Inc.
24.4%
 
20.8%
 
19.2%
CenturyLink, Inc.
14.5%
 
14.2%
 
13.8%
Comcast Corporation
13.6%
 
12.9%
 
11.7%
Verizon Communications Inc.
11.0%
 
7.6%
 
8.2%