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Accounts Receivable, Contract Assets, and Contract Liabilities
 3 Months Ended
Apr. 30, 2022
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):
April 30, 2022January 29, 2022
Trade accounts receivable$366,587 $330,811 
Unbilled accounts receivable607,960 545,493 
Retainage21,165 20,318 
Total995,712 896,622 
Less: allowance for doubtful accounts(761)(724)
Accounts receivable, net$994,951 $895,898 
 
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 Ended
April 30, 2022May 1, 2021
Allowance for doubtful accounts at beginning of period$724 $1,676 
Provision for bad debt32 2,823 
Amounts recovered (charged) against the allowance5 (262)
Allowance for doubtful accounts at end of period$761 $4,237 
Contract Assets and Contract Liabilities

Net contract assets consisted of the following (dollars in thousands):
April 30, 2022January 29, 2022
Contract assets$33,646 $24,539 
Contract liabilities 16,024 18,512 
Contract assets, net$17,622 $6,027 

During the three months ended April 30, 2022, we performed services and recognized $7.7 million of contract revenues related to contract liabilities that existed at January 29, 2022. 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 April 30, 2022 or January 29, 2022 were as follows (dollars in millions):

April 30, 2022January 29, 2022
Amount% of TotalAmount% of Total
Lumen Technologies$193.0 19.1%$166.0 18.4%
Verizon Communications Inc.$148.2 14.7%$144.3 16.0%
AT&T Inc.$140.0 13.8%$106.0 11.7%
Comcast Corporation$125.7 12.4%$113.5 12.6%
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 April 30, 2022 or January 29, 2022.