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Accounts Receivable, Contract Assets, and Contract Liabilities
 9 Months Ended
Oct. 30, 2021
Receivables [Abstract]  
Accounts Receivable, Contract Assets, and Contract Liabilities 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.

Accounts Receivable
 
Accounts receivable, net, classified as current, consisted of the following (dollars in thousands):
October 30, 2021January 30, 2021
Trade accounts receivable$363,770 $352,501 
Unbilled accounts receivable576,365 492,324 
Retainage21,145 14,974 
Total961,280 859,799 
Less: allowance for doubtful accounts(1,539)(1,676)
Accounts receivable, net$959,741 $858,123 
 
We maintain an allowance for doubtful accounts for estimated losses on uncollected balances. The allowance for doubtful accounts changed as follows (dollars in thousands):
For the Three Months EndedFor the Nine Months Ended
October 30, 2021October 24, 2020October 30, 2021October 24, 2020
Cumulative effect from implementation of ASU 2016-13$— $— $— $471 
Allowance for doubtful accounts at beginning of period1,527 1,605 1,676 4,582 
Provision for bad debt17 117 2,918 353 
Amounts charged against the allowance(5)29 (3,055)(3,655)
Allowance for doubtful accounts at end of period$1,539 $1,751 $1,539 $1,751 

Contract Assets and Contract Liabilities

Net contract assets consisted of the following (dollars in thousands):
October 30, 2021January 30, 2021
Contract assets$110,685 $197,110 
Contract liabilities 13,943 14,101 
Contract assets, net$96,742 $183,009 

Net contract assets were $96.7 million and $183.0 million as of October 30, 2021 and January 30, 2021, respectively. The decrease primarily resulted from increased billings and reduced services performed under contracts consisting of multiple tasks. During the three and nine months ended October 30, 2021, we performed services and recognized $2.3 million and $10.4 million, respectively, of contract revenues related to contract liabilities that existed at January 30, 2021. See Note 6, Other Current Assets and Other Assets, for information on our long-term contract assets.
Customer Credit Concentration

Customers whose combined amounts of accounts receivable and contract assets, net, exceeded 10% of total combined accounts receivable and contract assets, net, as of October 30, 2021 or January 30, 2021 were as follows (dollars in millions):

October 30, 2021January 30, 2021
Amount% of TotalAmount% of Total
Verizon Communications Inc.$233.5 22.1%$389.9 37.4%
Lumen Technologies(1)
$177.4 16.8%$173.5 16.6%
Comcast Corporation$131.5 12.4%$131.7 12.6%
AT&T Inc.$107.0 10.1%$71.7 6.9%
(1) Formerly known as CenturyLink, Inc.
We believe that none of the customers above were experiencing financial difficulties that would materially impact the collectability of the Company’s total accounts receivable and contract assets, net, as of October 30, 2021 or January 30, 2021.