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Concentration of Credit Risk (Tables)
 9 Months Ended
Apr. 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
10% of total revenue during the three or nine months ended April 26, 2014 or April 27, 2013:
 
For the Three Months Ended
 
For the Nine Months Ended
 
April 26, 2014
 
April 27, 2013
 
April 26, 2014
 
April 27, 2013
AT&T Inc. ("AT&T")
20.8%
 
17.4%
 
18.9%
 
15.0%
CenturyLink, Inc. ("CenturyLink")
12.8%
 
14.3%
 
14.3%
 
14.3%
Comcast Corporation ("Comcast")
12.1%
 
10.1%
 
11.5%
 
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 as of April 26, 2014 or July 27, 2013 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:
 
April 26, 2014
 
July 27, 2013
 
Amount
 
% of Total
 
Amount
 
% of Total
 
 
 
(Dollars in millions)
 
 
AT&T
$
73.8

 
17.1
%
 
$
57.4

 
12.6
%
CenturyLink
$
46.4

 
10.7
%
 
$
62.6

 
13.7
%
Windstream Corporation
$
34.5

 
8.0
%
 
$
59.4

 
13.0
%