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Concentration of Credit Risk (Tables)
 6 Months Ended
Jul. 28, 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 July 28, 2018 or January 27, 2018 were as follows (dollars in millions):
 
July 28, 2018
 
January 27, 2018
 
Amount
 
% of Total
 
Amount
 
% of Total
Verizon Communications Inc.
$
241.3

 
28.5%
 
$
98.2

 
14.4%
Comcast Corporation
$
160.8

 
19.0%
 
$
166.5

 
24.5%
CenturyLink, Inc.
$
126.5

 
15.0%
 
$
126.0

 
18.5%
AT&T Inc.
$
98.1

 
11.6%
 
$
79.2

 
11.6%
Total contract revenues by customer type during the three and six months ended July 28, 2018 and July 29, 2017 were as follows (dollars in millions):
 
For the Three Months Ended
 
For the Six Months Ended
 
July 28, 2018
 
July 29, 2017
 
July 28, 2018
 
July 29, 2017
 
Amount
 
% of Total
 
Amount
 
% of Total
 
Amount
 
% of Total
 
Amount
 
% of Total
Telecommunications
$
726.7

 
90.9%
 
$
712.0

 
91.3%
 
$
1,393.9

 
91.1%
 
$
1,437.4

 
91.8%
Underground facility locating
49.0

 
6.1
 
47.5

 
6.1
 
94.1

 
6.1
 
89.6

 
5.7
Electrical and gas utilities and other
23.8

 
3.0
 
20.7

 
2.6
 
42.8

 
2.8
 
39.5

 
2.5
Total contract revenues
$
799.5

 
100.0%
 
$
780.2

 
100.0%
 
$
1,530.8

 
100.0%
 
$
1,566.5

 
100.0%
Customers whose contract revenues exceeded 10% of total contract revenues during the three or six months ended July 28, 2018 or July 29, 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 Six Months Ended
 
July 28, 2018
 
July 29, 2017
 
July 28, 2018
 
July 29, 2017
 
Amount
 
% of Total
 
Amount
 
% of Total
 
Amount
 
% of Total
 
Amount
 
% of Total
Comcast Corporation
$
171.2

 
21.4%
 
$
153.1

 
19.6%
 
$
330.3

 
21.6
%
 
$
306.0

 
19.5
%
AT&T Inc.
165.2

 
20.7
 
163.5

 
21.0
 
342.2

 
22.4

 
376.6

 
24.0

Verizon Communications Inc.
147.3

 
18.4
 
78.3

 
10.0
 
269.5

 
17.6

 
145.1

 
9.3

CenturyLink, Inc.(1)
107.6

 
13.5
 
165.2

 
21.2
 
197.2

 
12.9

 
311.5

 
19.9

Total other customers combined
208.2

 
26.0
 
220.1

 
28.2
 
391.6

 
25.5
 
427.3

 
27.3
Total contract revenues
$
799.5

 
100.0%
 
$
780.2

 
100.0%
 
$
1,530.8

 
100.0
%
 
$
1,566.5

 
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.