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Accounts Receivable, Contract Assets, and Contract Liabilities | 6 Months Ended
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Jul. 31, 2021
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):
| July 31, 2021 |  | January 30, 2021
Trade accounts receivable | $ | 327,481 |  |  | $ | 352,501 |
Unbilled accounts receivable | 584,960 |  |  | 492,324 |
Retainage | 18,206 |  |  | 14,974 |
Total | 930,647 |  |  | 859,799 |
Less: allowance for doubtful accounts | (1,527) |  |  | (1,676) |
Accounts receivable, net | $ | 929,120 |  |  | $ | 858,123 |
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 |  | For the Six Months Ended |
| July 31, 2021 |  | July 25, 2020 |  | July 31, 2021 |  | July 25, 2020 |
Cumulative effect from implementation of ASU 2016-13 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 471 |  |
Allowance for doubtful accounts at beginning of period | 4,237 |  |  | 5,166 |  |  | 1,676 |  |  | 4,582 |  |
Provision for bad debt | 78 |  |  | 119 |  |  | 2,901 |  |  | 236 |  |
Amounts charged against the allowance | (2,788) |  |  | (3,680) |  |  | (3,050) |  |  | (3,684) |  |
Allowance for doubtful accounts at end of period | $ | 1,527 |  |  | $ | 1,605 |  |  | $ | 1,527 |  |  | $ | 1,605 |  |
Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
| July 31, 2021 |  | January 30, 2021
Contract assets | $ | 163,691 |  |  | $ | 197,110 |
Contract liabilities | 13,486 |  |  | 14,101 |
Contract assets, net | $ | 150,205 |  |  | $ | 183,009 |
Net contract assets were $150.2 million and $183.0 million as of July 31, 2021 and January 30, 2021, respectively. The decrease primarily resulted from reduced services performed and increased billings under contracts consisting of multiple tasks. During the three and six months ended July 31, 2021, we performed services and recognized $2.2 million and $8.1 million of contract revenues related to contract liabilities that existed at January 30, 2021. 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 July 31, 2021 or January 30, 2021 were as follows (dollars in millions):
| July 31, 2021 |  | January 30, 2021
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 333.7 |  |  | 30.9% |  | $ | 389.9 |  |  | 37.4%
Lumen Technologies(1) | $ | 163.4 |  |  | 15.1% |  | $ | 173.5 |  |  | 16.6%
Comcast Corporation | $ | 131.5 |  |  | 12.2% |  | $ | 131.7 |  |  | 12.6%
(1) Formerly known as CenturyLink, Inc. 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 July 31, 2021 or January 30, 2021.

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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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