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Accounts Receivable, Contract Assets, and Contract Liabilities
 3 Months Ended
Apr. 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.

Accounts Receivable
 
Accounts receivable, net, classified as current, consisted of the following (dollars in thousands):
April 27, 2024January 27, 2024
Trade accounts receivable$468,071 $462,034 
Unbilled accounts receivable861,297 734,442 
Retainage44,975 49,556 
Total1,374,343 1,246,032 
Less: allowance for doubtful accounts(1,539)(2,776)
Accounts receivable, net$1,372,804 $1,243,256 
 
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 27, 2024April 29, 2023
Allowance for doubtful accounts at beginning of period$2,776 $3,246 
(Recovery of) provision for bad debt(1,237)436 
Allowance for doubtful accounts at end of period$1,539 $3,682 
Contract Assets and Contract Liabilities

Net contract assets consisted of the following (dollars in thousands):
April 27, 2024January 27, 2024
Contract assets$68,460 $52,211 
Contract liabilities 57,466 39,122 
Contract assets, net$10,994 $13,089 

The decrease in net contract assets, net, primarily resulted from increased billings under contracts consisting of multiple tasks. During the three months ended April 27, 2024, we performed services and recognized $9.7 million, of contract revenues related to contract liabilities that existed at January 27, 2024. See Note 7, Other Current Assets and Other Assets, for information on our long-term contract assets.

Customer Credit Concentration
The combined amounts of accounts receivable and contract assets, net, for Lumen Technologies were $358.4, or 25.8%, and $345.0, or 27.4%, as of April 27, 2024 and January 27, 2024, respectively, of the total combined accounts receivable and contract assets, net. No other customer had combined amounts of accounts receivable and contract assets, net, which exceeded 10% of total combined accounts receivable and contract assets, net as of April 27, 2024 or January 27, 2024. We believe that none of our significant customers were experiencing financial difficulties that would materially impact the collectability of our total accounts receivable and contract assets, net, as of April 27, 2024 or January 27, 2024.