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Accounts Receivable
 3 Months Ended
Apr. 28, 2018
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable, Contract Assets, and Contract Liabilities

The following provides further details on the balance sheet accounts of accounts receivable, net, contract assets, and contract liabilities. See Note 2, Significant Accounting Policies and Estimates, for further information on the Company’s policies related to these balance sheet accounts, as well as its revenue recognition policies.

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


 
See Note 3, Accounting Standards, for further information on the comparative unbilled accounts receivable as of April 28, 2018 and January 27, 2018 as a result of the adoption of ASU 2014-09. Trade accounts receivable and unbilled accounts receivable increased $2.1 million and $3.9 million, respectively, from the fiscal 2019 acquisition.

During the three months ended April 28, 2018 and April 29, 2017, write-offs to the allowance for doubtful accounts, net of recoveries, were not material.

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



See Note 3, Accounting Standards, for further information on the comparative contract assets as of April 28, 2018 and January 27, 2018 as a result of the adoption of ASU 2014-09. Excluding the impact of the adoption of ASU 2014-09, the increase in contract assets is primarily a result of a general increase in services performed during the three months ended April 28, 2018 under the related contracts as compared to billing requirements met during the period. There were no other material changes in contract assets during the periods. During the three months ended April 28, 2018, the Company performed services and recognized an immaterial amount of revenue related to its contract liabilities that existed at January 27, 2018.

Customer Credit Concentration

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%


The Company believes that none of its significant customers were experiencing financial difficulties that would materially impact the collectability of the Company’s total accounts receivable and contract assets, net as of April 28, 2018 or January 27, 2018.