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Accounts Receivable, Contract Assets, and Contract Liabilities (Tables) | 9 Months Ended
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Oct. 28, 2023
Receivables [Abstract] |
Accounts Receivable | Accounts receivable, net, classified as current, consisted of the following (dollars in thousands):
| October 28, 2023 |  | January 28, 2023
Trade accounts receivable | $ | 583,621 |  |  | $ | 367,842 |
Unbilled accounts receivable | 838,471 |  |  | 670,066 |
Retainage | 42,643 |  |  | 32,351 |
Total | 1,464,735 |  |  | 1,070,259 |
Less: allowance for doubtful accounts | (3,565) |  |  | (3,246) |
Accounts receivable, net | $ | 1,461,170 |  |  | $ | 1,067,013 |
The allowance for doubtful accounts changed as follows (dollars in thousands):
| For the Three Months Ended |  | For the Nine Months Ended |
| October 28, 2023 |  | October 29, 2022 |  | October 28, 2023 |  | October 29, 2022 |
Allowance for doubtful accounts at beginning of period | $ | 3,801 |  |  | $ | 785 |  |  | $ | 3,246 |  |  | $ | 724 |  |
Provision for bad debt (recovery) | (205) |  |  | 2,012 |  |  | 1,028 |  |  | 2,149 |  |
Amounts charged against the allowance | (31) |  |  | — |  |  | (709) |  |  | (76) |  |
Allowance for doubtful accounts at end of period | $ | 3,565 |  |  | $ | 2,797 |  |  | $ | 3,565 |  |  | $ | 2,797 |  |
Contract Assets and Contract Liabilities | Net contract assets consisted of the following (dollars in thousands):
| October 28, 2023 |  | January 28, 2023
Contract assets | $ | 70,451 |  |  | $ | 43,932 |
Contract liabilities | 21,320 |  |  | 19,512 |
Contract assets, net | $ | 49,131 |  |  | $ | 24,420 |
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 October 28, 2023 or January 28, 2023 were as follows (dollars in millions):
| October 28, 2023 |  | January 28, 2023
| Amount |  | % of Total |  | Amount |  | % of Total
Lumen Technologies | $ | 381.2 |  |  | 25.2% |  | $ | 189.3 |  |  | 17.4%
Comcast Corporation | $ | 124.4 |  |  | 8.2% |  | $ | 125.2 |  |  | 11.5%
AT&T Inc. | $ | 102.6 |  |  | 6.8% |  | $ | 136.2 |  |  | 12.5%
Frontier Communications Corporation | $ | 100.8 |  |  | 6.7% |  | $ | 153.2 |  |  | 14.0%
Customers whose contract revenues exceeded 10% of total contract revenues during the three and nine months ended October 28, 2023 or October 29, 2022, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
| For the Three Months Ended |  | For the Nine Months Ended |
| October 28, 2023 |  | October 29, 2022 |  | October 28, 2023 |  | October 29, 2022 |
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |
AT&T Inc. | $ | 145.1 |  |  | 12.8% |  | $ | 258.2 |  |  | 24.8% |  | $ | 543.8 |  |  | 16.9% |  | $ | 751.5 |  |  | 26.0% |
Lumen Technologies | 187.6 |  |  | 16.5 |  | 142.9 |  |  | 13.6 |  | 486.5 |  |  | 15.1 |  | 373.3 |  |  | 12.9 |
Comcast Corporation | 111.2 |  |  | 9.8 |  | 108.8 |  |  | 10.4 |  | 351.3 |  |  | 10.9 |  | 331.9 |  |  | 11.5 |
Total other customers combined | 692.2 |  |  | 60.9 |  | 532.5 |  | 51.2 |  | 1,841.5 |  |  | 57.1 |  | 1,434.3 |  |  | 49.6 |
Total contract revenues | $ | 1,136.1 |  |  | 100.0% |  | $ | 1,042.4 |  |  | 100.0% |  | $ | 3,223.1 |  |  | 100.0% |  | $ | 2,891.0 |  |  | 100.0% |
Total contract revenues by customer type during the three and nine months ended October 28, 2023 and October 29, 2022 were as follows (dollars in millions):
| For the Three Months Ended |  | For the Nine Months Ended |
| October 28, 2023 |  | October 29, 2022 |  | October 28, 2023 |  | October 29, 2022 |
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |
Telecommunications | $ | 1,023.2 |  |  | 90.1% |  | $ | 940.7 |  |  | 90.3% |  | $ | 2,888.5 |  |  | 89.6% |  | $ | 2,590.5 |  |  | 89.6% |
Underground facility locating | 76.9 |  |  | 6.7 |  | 72.1 |  |  | 6.9 |  | 226.6 |  |  | 7.0 |  | 214.5 |  |  | 7.4 |
Electrical and gas utilities and other | 36.0 |  |  | 3.2 |  | 29.6 |  |  | 2.8 |  | 108.0 |  |  | 3.4 |  | 86.0 |  |  | 3.0 |
Total contract revenues | $ | 1,136.1 |  |  | 100.0% |  | $ | 1,042.4 |  |  | 100.0% |  | $ | 3,223.1 |  |  | 100.0% |  | $ | 2,891.0 |  |  | 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 -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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