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Concentration of Credit Risk (Tables)
 9 Months Ended
Oct. 27, 2018
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 combined amounts of trade accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of October 27, 2018 or January 27, 2018 were as follows (dollars in millions):
 
October 27, 2018
 
January 27, 2018
 
Amount
 
% of Total
 
Amount
 
% of Total
Verizon Communications Inc.
$
338.7

 
34.3%
 
$
98.2

 
14.4%
Comcast Corporation
$
166.6

 
16.9%
 
$
166.5

 
24.5%
CenturyLink, Inc.
$
142.8

 
14.5%
 
$
126.0

 
18.5%
AT&T Inc.
$
102.7

 
10.4%
 
$
79.2

 
11.6%
Total contract revenues by customer type during the three and nine months ended October 27, 2018 and October 28, 2017 were as follows (dollars in millions):
 
For the Three Months Ended
 
For the Nine Months Ended
 
October 27, 2018
 
October 28, 2017
 
October 27, 2018
 
October 28, 2017
 
Amount
 
% of Total
 
Amount
 
% of Total
 
Amount
 
% of Total
 
Amount
 
% of Total
Telecommunications
$
773.2

 
91.1%
 
$
687.3

 
90.9%
 
$
2,167.1

 
91.1%
 
$
2,124.7

 
91.5%
Underground facility locating
48.8

 
5.8
 
48.4

 
6.4
 
142.9

 
6.0
 
138.0

 
5.9
Electrical and gas utilities and other
26.2

 
3.1
 
20.5

 
2.7
 
69.1

 
2.9
 
60.0

 
2.6
Total contract revenues
$
848.2

 
100.0%
 
$
756.2

 
100.0%
 
$
2,379.1

 
100.0%
 
$
2,322.7

 
100.0%
Customers whose contract revenues exceeded 10% of total contract revenues during the three or nine months ended October 27, 2018 or October 28, 2017, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
 
For the Three Months Ended
 
For the Nine Months Ended
 
October 27, 2018
 
October 28, 2017
 
October 27, 2018
 
October 28, 2017
 
Amount
 
% of Total
 
Amount
 
% of Total
 
Amount
 
% of Total
 
Amount
 
% of Total
Comcast Corporation
$
176.3

 
20.8%
 
$
165.0

 
21.8%
 
$
506.7

 
21.3
%
 
$
471.0

 
20.3
%
Verizon Communications Inc.
174.1

 
20.5
 
80.6

 
10.7
 
443.5

 
18.6

 
225.7

 
9.7

AT&T Inc.
164.6

 
19.4
 
143.5

 
19.0
 
506.8

 
21.3

 
520.1

 
22.4

CenturyLink, Inc.(1)
118.8

 
14.0
 
146.1

 
19.3
 
316.0

 
13.3

 
457.6

 
19.7

Total other customers combined
214.4

 
25.3
 
221.0

 
29.2
 
606.1

 
25.5
 
648.3

 
27.9
Total contract revenues
$
848.2

 
100.0%
 
$
756.2

 
100.0%
 
$
2,379.1

 
100.0
%
 
$
2,322.7

 
100.0
%


(1) For comparison purposes in the table above, amounts from CenturyLink, Inc. and Level 3 Communications, Inc. have been combined for periods prior to their November 2017 merger.