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Accounts Receivable, Contract Assets, and Contract Liabilities
 3 Months Ended
Apr. 29, 2023
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 29, 2023January 28, 2023
Trade accounts receivable$405,431 $367,842 
Unbilled accounts receivable749,931 670,066 
Retainage33,191 32,351 
Total1,188,553 1,070,259 
Less: allowance for doubtful accounts(3,682)(3,246)
Accounts receivable, net$1,184,871 $1,067,013 
 
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 29, 2023April 30, 2022
Allowance for doubtful accounts at beginning of period$3,246 $724 
Provision for bad debt436 32 
Amounts recovered against the allowance— 5 
Allowance for doubtful accounts at end of period$3,682 $761 

Contract Assets and Contract Liabilities

Net contract assets consisted of the following (dollars in thousands):
April 29, 2023January 28, 2023
Contract assets$56,617 $43,932 
Contract liabilities 23,522 19,512 
Contract assets, net$33,095 $24,420 

The increase in net contract assets primarily resulted from increased services performed under contracts consisting of multiple tasks. During the three months ended April 29, 2023, we performed services and recognized $10.7 million of contract revenues related to contract liabilities that existed at January 28, 2023. 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 29, 2023 or January 28, 2023 were as follows (dollars in millions):

April 29, 2023January 28, 2023
Amount% of TotalAmount% of Total
Lumen Technologies$245.8 20.1%$189.3 17.4%
Frontier Communications Corporation$192.1 15.7%$153.2 14.0%
AT&T Inc.$135.0 11.0%$136.2 12.5%
Comcast Corporation$122.5 10.0%$125.2 11.5%
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 29, 2023 or January 28, 2023.