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Concentration of Credit Risk (Tables)
 12 Months Ended
Jul. 25, 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 fiscal 2015, 2014, or 2013 were as follows:

 
Fiscal Year Ended
 
2015
 
2014
 
2013
AT&T Inc.
20.8%
 
19.2%
 
15.5%
CenturyLink, Inc.
14.2%
 
13.8%
 
14.6%
Comcast Corporation
12.9%
 
11.7%
 
10.9%
Schedule of Customers Representing 10% or More of Combined Amounts of Trade Accounts Receivable and Costs and Estimated Earnings in Excess of Billings with the Following Outstanding Balances and Related Percentages of the Company’s Total Outstanding Balances
ustomers represented 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings, net ("CIEB, net") as of July 25, 2015 or July 26, 2014. AT&T Inc. represented $101.7 million, or 17.7% of combined amounts of trade accounts receivable and CIEB, net as of July 25, 2015 and $87.6 million, or 17.9% as of July 26, 2014. CenturyLink, Inc. represented $80.1 million, or 14.0% of combined amounts of trade accounts receivable and CIEB, net as of July 25, 2015 and $48.2 million, or 9.8% as of July 26, 2014. In addition, Comcast Corporation represented $63.0 million, or 11.0% of combined amounts of trade accounts receivable and CIEB, net as of July 25, 2015