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Concentration of Credit Risk (Notes)
 9 Months Ended
Apr. 27, 2013
Risks and Uncertainties [Abstract]  
Concentration of Credit Risk
Concentration of Credit Risk

The Company’s customer base is highly concentrated. The top five customers accounted for approximately 58.6% and 59.1% of its total revenues for the nine months ended April 27, 2013 and April 28, 2012, respectively. AT&T Inc. ("AT&T"), CenturyLink, Inc. ("CenturyLink"), Comcast Corporation ("Comcast"), and Verizon Communications, Inc. ("Verizon") represent a significant portion of the Company’s customer base and each were over 10% of total revenue during the three or nine months ended April 27, 2013 or April 28, 2012 as reflected in the following table:
 
For the Three Months Ended
For the Nine Months Ended
 
April 27, 2013
 
April 28, 2012
 
April 27, 2013
 
April 28, 2012
AT&T
17.4%
 
13.4%
 
15.0%
 
14.1%
CenturyLink
14.3%
 
13.0%
 
14.3%
 
13.6%
Comcast
10.1%
 
12.5%
 
11.2%
 
12.7%
Verizon
8.9%
 
11.1%
 
9.3%
 
11.0%


The Company believes that none of its significant customers were experiencing financial difficulties that would materially impact the collectability of the Company’s trade accounts receivable and costs in excess of billings as of April 27, 2013. Customers representing 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings as of April 27, 2013 or July 28, 2012 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:
 
April 27, 2013
 
July 28, 2012
 
Amount
 
% of Total
 
Amount
 
% of Total
 
 
 
(Dollars in millions)
 
 
AT&T
$
53.3

 
12.7
%
 
$
24.7

 
9.2
%
CenturyLink
$
51.8

 
12.4
%
 
$
47.6

 
17.7
%
Verizon
$
41.6

 
10.0
%
 
$
30.5

 
11.3
%
Windstream Corporation
$
61.8

 
14.8
%
 
$
35.4

 
13.2
%