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Concentration of Credit Risk (Tables)
 12 Months Ended
Jul. 26, 2014
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 2014, 2013 or 2012 are as follows:
 
Fiscal Year Ended
 
2014
 
2013
 
2012
AT&T Inc.
19.2%
 
15.5%
 
13.7%
CenturyLink, Inc.
13.8%
 
14.6%
 
13.6%
Comcast Corporation
11.7%
 
10.9%
 
12.6%
Verizon Communications Inc.
8.2%
 
9.6%
 
11.3%
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
Customers representing 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings, net as of July 26, 2014 or July 27, 2013 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:
 
July 26, 2014
 
July 27, 2013
 
Amount
 
% of Total
 
Amount
 
% of Total
 
 
 
(Dollars in millions)
 
 
AT&T Inc.
$
87.6

 
17.9
%
 
$
57.4

 
12.6
%
CenturyLink, Inc.
$
48.2

 
9.8
%
 
$
62.6

 
13.7
%
Windstream Corporation
$
43.6

 
8.9
%
 
$
59.4

 
13.0
%