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Accounts Receivable (Tables) | 12 Months Ended
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Jan. 30, 2021
Receivables [Abstract] |
Schedule of Accounts Receivable | Accounts receivable, net classified as current, consisted of the following (dollars in thousands):
| January 30, 2021 |  | January 25, 2020
Trade accounts receivable | $ | 352,501 |  |  | $ | 355,805 |
Unbilled accounts receivable | 492,324 |  |  | 453,353 |
Retainage | 14,974 |  |  | 12,669 |
Total | 859,799 |  |  | 821,827 |
Less: allowance for doubtful accounts | (1,676) |  |  | (4,582) |
Accounts receivable, net | $ | 858,123 |  |  | $ | 817,245 |
The allowance for doubtful accounts changed as follows (dollars in thousands):
| January 30, 2021 |  | January 25, 2020
Allowance for doubtful accounts at beginning of period | $ | 4,582 |  |  | $ | 17,702 |
Cumulative effect from implementation of ASU 2016-13 | 471 |  |  | — |
Provision for bad debt (recovery) | 406 |  |  | (6,540) |
Amounts charged against the allowance | (3,783) |  |  | (6,580) |
Allowance for doubtful accounts at end of period | $ | 1,676 |  |  | $ | 4,582 |
Contract with Customer, Asset and Liability [Table Text Block] | Net contract assets consisted of the following (dollars in thousands):
| January 30, 2021 |  | January 25, 2020
Contract assets | $ | 197,110 |  |  | $ | 253,005 |
Contract liabilities | 14,101 |  |  | 16,332 |
Contract assets, net | $ | 183,009 |  |  | $ | 236,673 |
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 30, 2021 or January 25, 2020 were as follows (dollars in millions):
| January 30, 2021 |  | January 25, 2020
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 389.9 |  |  | 37.4 | % |  | $ | 440.2 |  |  | 41.8 | %
Lumen Technologies (1) | $ | 173.5 |  |  | 16.6 | % |  | $ | 175.8 |  |  | 16.7 | %
Comcast Corporation | $ | 131.7 |  |  | 12.6 | % |  | $ | 114.0 |  |  | 10.8 | %
(1) Formerly known as CenturyLink, Inc. Customers whose contract revenues exceeded 10% of total contract revenues during fiscal 2021, fiscal 2020, and fiscal 2019, as well as total contract revenues from all other customers combined, were as follows:
| Fiscal Year Ended |
| January 30, 2021 |  | January 25, 2020 |  | January 26, 2019 |
| Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total |
Verizon Communications Inc. | $ | 601.6 |  | 18.8 | % |  | $ | 728.2 |  | 21.8 | % |  | $ | 599.8 |  | 19.2 | % |
Lumen Technologies (1) | 542.0 |  | 16.9 | % |  | 547.8 |  | 16.4 | % |  | 425.6 |  | 13.6 | % |
Comcast Corporation | 533.9 |  | 16.7 | % |  | 503.2 |  | 15.1 | % |  | 650.2 |  | 20.8 | % |
AT&T Inc. | 533.7 |  | 16.7 | % |  | 687.9 |  | 20.6 | % |  | 664.2 |  | 21.2 | % |
Total other customers combined | 988.0 |  | 30.9 | % |  | 872.6 |  | 26.1 | % |  | 787.9 |  | 25.2 | % |
Total contract revenues | $ | 3,199.2 |  | 100.0% |  | $ | 3,339.7 |  | 100.0% |  | $3,127.7 | 100.0% |
(1) Formerly known as CenturyLink, Inc. Total contract revenues by customer type during fiscal 2021, fiscal 2020, and fiscal 2019, were as follows (dollars in millions):
| Fiscal Year Ended |
| January 30, 2021 |  | January 25, 2020 |  | January 26, 2019 |
| Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total |
Telecommunications | $ | 2,851.6 |  | 89.1% |  | $ | 3,031.9 |  | 90.8% |  | $ | 2,855.8 |  | 91.3% |
Underground facility locating | 229.6 |  | 7.2% |  | 204.5 |  | 6.1% |  | 182.7 |  | 5.8% |
Electrical and gas utilities and other | 118.0 |  | 3.7% |  | 103.3 |  | 3.1% |  | 89.2 |  | 2.9% |
Total contract revenues | $ | 3,199.2 |  | 100.0% |  | $ | 3,339.7 |  | 100.0% |  | $ | 3,127.7 |  | 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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