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Accounts Receivable, Contract Assets, and Contract Liabilities
 12 Months Ended
Jan. 27, 2024
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. See Note 2, Significant Accounting Policies and Estimates, for further information on our policies related to these balance sheet accounts, as well as our revenue recognition policies.

Accounts Receivable
 
Accounts receivable, net classified as current, consisted of the following (dollars in thousands):
January 27, 2024January 28, 2023
Trade accounts receivable$462,034 $367,842 
Unbilled accounts receivable734,442 670,066 
Retainage49,556 32,351 
Total1,246,032 1,070,259 
Less: allowance for doubtful accounts(2,776)(3,246)
Accounts receivable, net$1,243,256 $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):
January 27, 2024January 28, 2023
Allowance for doubtful accounts at beginning of period$3,246 $724 
Provision for bad debt274 2,600 
Amounts charged against the allowance(744)(78)
Allowance for doubtful accounts at end of period$2,776 $3,246 
Contract Assets and Contract Liabilities

Net contract assets consisted of the following (dollars in thousands):
January 27, 2024January 28, 2023
Contract assets$52,211 $43,932 
Contract liabilities39,122 19,512 
Contract assets, net$13,089 $24,420 

The decrease in contract assets, net, in fiscal 2024 from fiscal 2023 primarily resulted from increased billings under contracts consisting of multiple tasks. There were no other significant changes in contract assets during the period. During fiscal 2024, we performed services and recognized $18.2 million of contract revenues related to contract liabilities that existed at January 28, 2023. See Note 7, 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 January 27, 2024 or January 28, 2023 were as follows (dollars in millions):

January 27, 2024January 28, 2023
Amount% of TotalAmount% of Total
Lumen Technologies$345.0 27.4 %$189.3 17.4 %
Comcast Corporation$104.7 8.3 %$125.2 11.5 %
AT&T Inc.$90.3 7.2 %$136.2 12.5 %

We believe that none of the customers above were experiencing financial difficulties that would materially impact the collectability of our total accounts receivable and contract assets, net, as of January 27, 2024 or January 28, 2023.