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Concentration of Credit Risk
 9 Months Ended
Apr. 29, 2017
Risks and Uncertainties [Abstract]  
Concentration of Credit Risk
Concentration of Credit Risk

The Company’s customer base is highly concentrated, with its top five customers during each of the nine months ended April 29, 2017 and April 23, 2016 accounting for approximately 76.3% and 68.8% of its total contract revenues, respectively. Customers whose contract revenues exceeded 10% of total contract revenue during the three or nine months ended April 29, 2017 or April 23, 2016 were as follows:
 
For the Three Months Ended
 
For the Nine Months Ended
 
April 29, 2017
 
April 23, 2016
 
April 29, 2017
 
April 23, 2016
AT&T Inc.
27.1%
 
26.8%
 
28.1%
 
22.8%
Comcast Corporation
19.4%
 
14.4%
 
17.1%
 
13.3%
CenturyLink, Inc.
17.7%
 
13.7%
 
16.6%
 
14.7%
Verizon Communications Inc.(1)
8.5%
 
10.6%
 
8.9%
 
10.7%


Customers whose combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings, net (“CIEB, net”) exceeded 10% of total combined trade receivables and CIEB, net as of April 29, 2017 or July 30, 2016 were as follows (dollars in millions):
 
April 29, 2017
 
July 30, 2016
 
Amount
 
% of Total
 
Amount
 
% of Total
Comcast Corporation
$
172.5

 
22.4%
 
$
95.3

 
13.9%
CenturyLink, Inc.
$
118.4

 
15.4%
 
$
79.0

 
11.5%
AT&T Inc.
$
109.5

 
14.2%
 
$
138.8

 
20.3%
Windstream Corporation
$
89.5

 
11.6%
 
$
79.0

 
11.5%
Verizon Communications Inc.(1)
$
63.0

 
8.2%
 
$
70.2

 
10.2%


(1) For comparison purposes in the above tables, amounts from Verizon Communications Inc. and XO Communications LLC’s fiber-optic network business have been combined for periods prior to their February 2017 merger.

In addition, another customer had combined amounts of trade accounts receivable and CIEB, net of $71.6 million, or 9.3%, as of April 29, 2017, and $71.5 million, or 10.4%, as of July 30, 2016.

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 29, 2017. See Note 4, Accounts Receivable, and Note 5, Costs and Estimated Earnings in Excess of Billings, for additional information regarding the Company’s trade accounts receivable and costs and estimated earnings in excess of billings.