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Concentration of Credit Risk (Tables)
 6 Months Ended
Jan. 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 or six months ended January 24, 2015 or January 25, 2014 are as follows:
 
For the Three Months Ended
 
For the Six Months Ended
 
January 24, 2015
 
January 25, 2014
 
January 24, 2015
 
January 25, 2014
AT&T Inc.
22.0%
 
18.7%
 
21.6%
 
18.0%
CenturyLink, Inc.
14.0%
 
14.4%
 
13.5%
 
15.0%
Comcast Corporation
13.1%
 
12.0%
 
12.9%
 
11.2%
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 January 24, 2015 or July 26, 2014 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:
 
January 24, 2015
 
July 26, 2014
 
Amount
 
% of Total
 
Amount
 
% of Total
 
 
 
(Dollars in millions)
 
 
AT&T Inc.
$
84.1

 
18.1
%
 
$
87.6

 
17.9
%
Comcast Corporation
$
50.1

 
10.8
%
 
$
48.9

 
9.9
%
CenturyLink, Inc.
$
46.7

 
10.1
%
 
$
48.2

 
9.8
%