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Accounts Receivable, Contract Assets, and Contract Liabilities (Tables) | 6 Months Ended
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Jul. 31, 2021
Receivables [Abstract] |
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 |
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 |
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%
Customers whose contract revenues exceeded 10% of total contract revenues during the three and six months ended July 31, 2021 or July 25, 2020, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
| For the Three Months Ended |  | For the Six Months Ended |
| July 31, 2021 |  | July 25, 2020 |  | July 31, 2021 |  | July 25, 2020 |
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |
AT&T Inc. | $ | 177.5 |  |  | 22.5% |  | $ | 134.6 |  |  | 16.3% |  | $ | 333.1 |  |  | 22.0% |  | $ | 288.6 |  |  | 17.6% |
Comcast Corporation | 121.7 |  |  | 15.5 |  | 131.4 |  |  | 15.9 |  | 252.8 |  |  | 16.7 |  | 249.3 |  |  | 15.2 |
Verizon Communications Inc. | 90.8 |  |  | 11.5 |  | 163.0 |  | 19.8 |  | 182.3 |  |  | 12.0 |  | 339.1 |  | 20.7 |
Lumen Technologies(1) | 95.4 |  |  | 12.1 |  | 158.4 |  |  | 19.2 |  | 181.2 |  |  | 12.0 |  | 307.1 |  |  | 18.7 |
Total other customers combined | 302.2 |  |  | 38.4 |  | 236.5 |  | 28.7 |  | 565.7 |  |  | 37.3 |  | 454.1 |  | 27.7 |
Total contract revenues | $ | 787.6 |  |  | 100.0% |  | $ | 823.9 |  |  | 100.0% |  | $ | 1,515.1 |  |  | 100.0% |  | $ | 1,638.2 |  |  | 100.0% |
Total contract revenues by customer type during the three and six months ended July 31, 2021 and July 25, 2020 were as follows (dollars in millions):
| For the Three Months Ended |  | For the Six Months Ended |
| July 31, 2021 |  | July 25, 2020 |  | July 31, 2021 |  | July 25, 2020 |
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |
Telecommunications | $ | 697.5 |  |  | 88.6% |  | $ | 746.7 |  |  | 90.6% |  | $ | 1,337.2 |  |  | 88.3% |  | $ | 1,472.7 |  |  | 89.9% |
Underground facility locating | 65.8 |  |  | 8.3 |  | 58.9 |  |  | 7.2 |  | 130.7 |  |  | 8.6 |  | 112.3 |  |  | 6.9 |
Electrical and gas utilities and other | 24.3 |  |  | 3.1 |  | 18.3 |  |  | 2.2 |  | 47.2 |  |  | 3.1 |  | 53.2 |  |  | 3.2 |
Total contract revenues | $ | 787.6 |  |  | 100.0% |  | $ | 823.9 |  |  | 100.0% |  | $ | 1,515.1 |  |  | 100.0% |  | $ | 1,638.2 |  |  | 100.0% |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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