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Accounts Receivable (Tables)
 3 Months Ended
Apr. 28, 2018
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable consisted of the following (dollars in thousands):
 
April 28, 2018
 
January 27, 2018
Trade accounts receivable
$
309,724

 
$
300,271

Unbilled accounts receivable
318,007

 
—

Retainage
18,225

 
19,411

Total
645,956

 
319,682

Less: allowance for doubtful accounts
(976
)
 
(998
)
Accounts receivable, net
$
644,980

 
$
318,684
Contract with Customer, Asset and Liability
Contract Assets and Contract Liabilities

Net contract assets consisted of the following (dollars in thousands):
 
April 28, 2018
 
January 27, 2018
Contract assets
$
101,163

 
$
369,472

Contract liabilities
5,730

 
6,480

Contract assets, net
$
95,433

 
$
362,992
Accounts Receivable Risk
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 April 28, 2018 or January 27, 2018 were as follows (dollars in millions):
 
April 28, 2018
 
January 27, 2018
 
Amount
 
% of Total
 
Amount
 
% of Total
Comcast Corporation
$
164.2

 
22.2%
 
$
166.5

 
24.5%
Verizon Communications Inc.
$
156.5

 
21.1%
 
$
98.2

 
14.4%
CenturyLink, Inc.
$
120.3

 
16.3%
 
$
126.0

 
18.5%
AT&T Inc.
$
102.8

 
13.9%
 
$
79.2

 
11.6%
Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended April 28, 2018 or April 29, 2017, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
 
For the Three Months Ended
 
April 28, 2018
 
April 29, 2017
 
Amount
 
% of Total
 
Amount
 
% of Total
AT&T Inc.
$
177.0

 
24.2%
 
$
213.1

 
27.1%
Comcast Corporation
159.2

 
21.8
 
152.9

 
19.4
Verizon Communications Inc.
122.1

 
16.7
 
66.8

 
8.5
CenturyLink, Inc.(1)
89.7

 
12.3
 
146.2

 
18.6
Total other customers combined
183.4

 
25.0
 
207.3

 
26.4
Total contract revenues
$
731.4

 
100.0%
 
$
786.3

 
100.0%
Total contract revenues by customer type during the three months ended April 28, 2018 and April 29, 2017 were as follows (dollars in millions):
 
For the Three Months Ended
 
April 28, 2018
 
April 29, 2017
 
Amount
 
% of Total
 
Amount
 
% of Total
Telecommunications
$
667.2

 
91.2%
 
$
725.3

 
92.2%
Underground facility locating
45.1

 
6.2
 
42.1

 
5.4
Electrical and gas utilities and other
19.1

 
2.6
 
18.9

 
2.4
Total contract revenues
$
731.4

 
100.0%
 
$
786.3

 
100.0%