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Accounts Receivable, Contract Assets, and Contract Liabilities (Tables) | 6 Months Ended
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Jul. 25, 2020
Receivables [Abstract] |
Accounts Receivable | Accounts receivable, net, classified as current, consisted of the following (dollars in thousands):
| July 25, 2020 |  | January 25, 2020
Trade accounts receivable | $ | 378,461 |  |  | $ | 355,805 |
Unbilled accounts receivable | 508,123 |  |  | 453,353 |
Retainage | 12,854 |  |  | 12,669 |
Total | 899,438 |  |  | 821,827 |
Less: allowance for doubtful accounts | (1,605) |  |  | (4,582) |
Accounts receivable, net | $ | 897,833 |  |  | $ | 817,245 |
The allowance for doubtful accounts changed as follows (dollars in thousands):
| For the Three Months Ended |  |  |  | For the Six Months Ended |  |
| July 25, 2020 |  | July 27, 2019 |  | July 25, 2020 |  | July 27, 2019
Allowance for doubtful accounts at beginning of period | $ | 5,166 |  |  | $ | 1,372 |  |  | $ | 4,582 |  |  | $ | 17,702 |
Cumulative effect from implementation of ASU 2016-13 | — |  |  | — |  |  | 471 |  |  | — |
Provision for bad debt (recovery) | 119 |  |  | (202) |  |  | 236 |  |  | (10,514) |
Amounts recovered (charged) against the allowance | (3,680) |  |  | (246) |  |  | (3,684) |  |  | (6,264) |
Allowance for doubtful accounts at end of period | $ | 1,605 |  |  | $ | 924 |  |  | $ | 1,605 |  |  | $ | 924 |
Contract Assets and Contract Liabilities | Net contract assets consisted of the following (dollars in thousands):
| July 25, 2020 |  | January 25, 2020
Contract assets | $ | 257,893 |  |  | $ | 253,005 |
Contract liabilities | 18,829 |  |  | 16,332 |
Contract assets, net | $ | 239,064 |  |  | $ | 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 July 25, 2020 or January 25, 2020 were as follows (dollars in millions):
| July 25, 2020 |  |  |  | January 25, 2020 |  |
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 462.3 |  |  | 40.7% |  | $ | 440.2 |  |  | 41.8%
CenturyLink, Inc. | $ | 204.1 |  |  | 18.0% |  | $ | 175.8 |  |  | 16.7%
Comcast Corporation | $ | 142.7 |  |  | 12.6% |  | $ | 114.0 |  |  | 10.8%
Customers whose contract revenues exceeded 10% of total contract revenues during the three and six months ended July 25, 2020 or July 27, 2019, 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 25, 2020 |  |  |  | July 27, 2019 |  |  |  | July 25, 2020 |  |  |  | July 27, 2019 |  |
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 163.0 |  |  | 19.8% |  | $ | 205.0 |  |  | 23.2% |  | $ | 339.1 |  |  | 20.7% |  | $ | 384.8 |  |  | 22.4%
CenturyLink, Inc. | 158.4 |  |  | 19.2 |  | 138.7 |  | 15.7 |  | 307.1 |  | 18.7 |  | 248.5 |  | 14.5
AT&T Inc. | 134.6 |  |  | 16.3 |  | 183.3 |  |  | 20.7 |  | 288.6 |  |  | 17.6 |  | 392.5 |  |  | 22.8
Comcast Corporation | 131.4 |  |  | 15.9 |  | 133.2 |  |  | 15.1 |  | 249.3 |  |  | 15.2 |  | 270.3 |  |  | 15.7
Total other customers combined | 236.5 |  | 28.7 |  | 224.0 |  | 25.3 |  | 454.1 |  | 27.7 |  | 421.9 |  | 24.6
Total contract revenues | $ | 823.9 |  |  | 100.0% |  | $ | 884.2 |  |  | 100.0% |  | $ | 1,638.2 |  |  | 100.0% |  | $ | 1,718.0 |  |  | 100.0%
Total contract revenues by customer type during the three and six months ended July 25, 2020 and July 27, 2019 were as follows (dollars in millions):
| For the Three Months Ended |  |  |  |  |  |  |  | For the Six Months Ended |  |  |  |  |  |
| July 25, 2020 |  |  |  | July 27, 2019 |  |  |  | July 25, 2020 |  |  |  | July 27, 2019 |  |
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Telecommunications | $ | 746.7 |  |  | 90.6% |  | $ | 804.4 |  |  | 91.0% |  | $ | 1,472.7 |  |  | 89.9% |  | $ | 1,565.8 |  |  | 91.1%
Underground facility locating | 58.9 |  |  | 7.2 |  | 53.8 |  |  | 6.1 |  | 112.3 |  |  | 6.9 |  | 102 |  |  | 5.9
Electrical and gas utilities and other | 18.3 |  |  | 2.2 |  | 26.0 |  |  | 2.9 |  | 53.2 |  |  | 3.2 |  | 50.2 |  |  | 3.0
Total contract revenues | $ | 823.9 |  |  | 100.0% |  | $ | 884.2 |  |  | 100.0% |  | $ | 1,638.2 |  |  | 100.0% |  | $ | 1,718.0 |  |  | 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 -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=6877327&loc=d3e13212-122682 + Details
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