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Concentration of Credit Risk (Tables)
 3 Months Ended
Oct. 28, 2017
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 contract revenues exceeded 10% of total contract revenues during the three months ended October 28, 2017 or October 29, 2016 were as follows:
 
For the Three Months Ended
 
October 28, 2017
 
October 29, 2016
Comcast Corporation
21.8%
 
15.1%
AT&T Inc.
19.0%
 
29.0%
CenturyLink, Inc.
18.9%
 
15.7%
Verizon Communications Inc.(1)
10.7%
 
9.4%
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 October 28, 2017 or July 29, 2017 were as follows (dollars in millions):
 
October 28, 2017
 
July 29, 2017
 
Amount
 
% of Total
 
Amount
 
% of Total
Comcast Corporation
$
170.8

 
22.9%
 
$
159.7

 
21.3%
CenturyLink, Inc.
$
130.1

 
17.4%
 
$
136.1

 
18.1%
Verizon Communications Inc.(1)
$
84.3

 
11.3%
 
$
73.7

 
9.8%
AT&T Inc.
$
83.7

 
11.2%
 
$
87.1

 
11.6%
Windstream Corporation
$
72.0

 
9.6%
 
$
84.7

 
11.3%

(1)For comparison purposes in the tables above, 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.