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Accounts Receivable, Contract Assets, and Contract Liabilities
 6 Months Ended
Jul. 31, 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):
July 31, 2021January 30, 2021
Trade accounts receivable$327,481 $352,501 
Unbilled accounts receivable584,960 492,324 
Retainage18,206 14,974 
Total930,647 859,799 
Less: allowance for doubtful accounts(1,527)(1,676)
Accounts receivable, net$929,120 $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 Six Months Ended
July 31, 2021July 25, 2020July 31, 2021July 25, 2020
Cumulative effect from implementation of ASU 2016-13$— $— $— $471 
Allowance for doubtful accounts at beginning of period4,237 5,166 1,676 4,582 
Provision for bad debt78 119 2,901 236 
Amounts charged against the allowance(2,788)(3,680)(3,050)(3,684)
Allowance for doubtful accounts at end of period$1,527 $1,605 $1,527 $1,605 

Contract Assets and Contract Liabilities

Net contract assets consisted of the following (dollars in thousands):
July 31, 2021January 30, 2021
Contract assets$163,691 $197,110 
Contract liabilities 13,486 14,101 
Contract assets, net$150,205 $183,009 

Net contract assets were $150.2 million and $183.0 million as of July 31, 2021 and January 30, 2021, respectively. The decrease primarily resulted from reduced services performed and increased billings under contracts consisting of multiple tasks. During the three and six months ended July 31, 2021, we performed services and recognized $2.2 million and $8.1 million 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 July 31, 2021 or January 30, 2021 were as follows (dollars in millions):
July 31, 2021January 30, 2021
Amount% of TotalAmount% of Total
Verizon Communications Inc.$333.7 30.9%$389.9 37.4%
Lumen Technologies(1)
$163.4 15.1%$173.5 16.6%
Comcast Corporation$131.5 12.2%$131.7 12.6%
(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 July 31, 2021 or January 30, 2021.