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Accounts Receivable, Contract Assets, and Contract Liabilities | 12 Months Ended
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Jan. 28, 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. 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 28, 2023 |  | January 29, 2022
Trade accounts receivable | $ | 367,842 |  |  | $ | 330,811 |
Unbilled accounts receivable | 670,066 |  |  | 545,493 |
Retainage | 32,351 |  |  | 20,318 |
Total | 1,070,259 |  |  | 896,622 |
Less: allowance for doubtful accounts | (3,246) |  |  | (724) |
Accounts receivable, net | $ | 1,067,013 |  |  | $ | 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):
| January 28, 2023 |  | January 29, 2022
Allowance for doubtful accounts at beginning of period | $ | 724 |  |  | $ | 1,676 |
Provision for bad debt | 2,600 |  |  | 2,911 |
Amounts charged against the allowance | (78) |  |  | (3,863) |
Allowance for doubtful accounts at end of period | $ | 3,246 |  |  | $ | 724 |
Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
| January 28, 2023 |  | January 29, 2022
Contract assets | $ | 43,932 |  |  | $ | 24,539 |
Contract liabilities | 19,512 |  |  | 18,512 |
Contract assets, net | $ | 24,420 |  |  | $ | 6,027 |
The increase in contract assets, net, in fiscal 2023 from fiscal 2022 primarily resulted from reduced services performed and increased billings under contracts consisting of multiple tasks. There were no other significant changes in contract assets during the period. During fiscal 2023, we performed services and recognized $15.9 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 January 28, 2023 or January 29, 2022 were as follows (dollars in millions):
| January 28, 2023 |  | January 29, 2022
| Amount |  | % of Total |  | Amount |  | % of Total
Lumen Technologies | $ | 189.3 |  |  | 17.4 | % |  | $ | 166.0 |  |  | 18.4 | %
AT&T Inc. | $ | 136.2 |  |  | 12.5 | % |  | $ | 106.0 |  |  | 11.7 | %
Comcast Corporation | $ | 125.2 |  |  | 11.5 | % |  | $ | 113.5 |  |  | 12.6 | %
Verizon Communications Inc. | $ | 102.7 |  |  | 9.4 | % |  | $ | 144.3 |  |  | 16.0 | %
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 28, 2023 or January 29, 2022.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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