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Accounts Receivable (Tables) | 9 Months Ended
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Oct. 27, 2018
Receivables [Abstract] |
Schedule of Accounts Receivable | Accounts receivable consisted of the following (dollars in thousands):
| October 27, 2018 |  | January 27, 2018
Trade accounts receivable | $ | 464,332 |  |  | $ | 300,271 |
Unbilled accounts receivable | 372,351 |  |  | — |
Retainage | 14,032 |  |  | 19,411 |
Total | 850,715 |  |  | 319,682 |
Less: allowance for doubtful accounts | (946 | ) |  | (998 | )
Accounts receivable, net | $ | 849,769 |  |  | $ | 318,684 |
Contract with Customer, Asset and Liability | Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
| October 27, 2018 |  | January 27, 2018
Contract assets | $ | 147,320 |  |  | $ | 369,472 |
Contract liabilities | 7,631 |  |  | 6,480 |
Contract assets, net | $ | 139,689 |  |  | $ | 362,992 |
Accounts Receivable Risk | Customers whose combined amounts of trade accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of October 27, 2018 or January 27, 2018 were as follows (dollars in millions):
| October 27, 2018 |  | January 27, 2018
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 338.7 |  |  | 34.3% |  | $ | 98.2 |  |  | 14.4%
Comcast Corporation | $ | 166.6 |  |  | 16.9% |  | $ | 166.5 |  |  | 24.5%
CenturyLink, Inc. | $ | 142.8 |  |  | 14.5% |  | $ | 126.0 |  |  | 18.5%
AT&T Inc. | $ | 102.7 |  |  | 10.4% |  | $ | 79.2 |  |  | 11.6%
Total contract revenues by customer type during the three and nine months ended October 27, 2018 and October 28, 2017 were as follows (dollars in millions):
| For the Three Months Ended |  | For the Nine Months Ended
| October 27, 2018 |  | October 28, 2017 |  | October 27, 2018 |  | October 28, 2017
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Telecommunications | $ | 773.2 |  |  | 91.1% |  | $ | 687.3 |  |  | 90.9% |  | $ | 2,167.1 |  |  | 91.1% |  | $ | 2,124.7 |  |  | 91.5%
Underground facility locating | 48.8 |  |  | 5.8 |  | 48.4 |  |  | 6.4 |  | 142.9 |  |  | 6.0 |  | 138.0 |  |  | 5.9
Electrical and gas utilities and other | 26.2 |  |  | 3.1 |  | 20.5 |  |  | 2.7 |  | 69.1 |  |  | 2.9 |  | 60.0 |  |  | 2.6
Total contract revenues | $ | 848.2 |  |  | 100.0% |  | $ | 756.2 |  |  | 100.0% |  | $ | 2,379.1 |  |  | 100.0% |  | $ | 2,322.7 |  |  | 100.0%
Customers whose contract revenues exceeded 10% of total contract revenues during the three or nine months ended October 27, 2018 or October 28, 2017, 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 27, 2018 |  | October 28, 2017 |  | October 27, 2018 |  | October 28, 2017
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Comcast Corporation | $ | 176.3 |  |  | 20.8% |  | $ | 165.0 |  |  | 21.8% |  | $ | 506.7 |  |  | 21.3 | % |  | $ | 471.0 |  |  | 20.3 | %
Verizon Communications Inc. | 174.1 |  |  | 20.5 |  | 80.6 |  |  | 10.7 |  | 443.5 |  |  | 18.6 |  |  | 225.7 |  |  | 9.7 |
AT&T Inc. | 164.6 |  |  | 19.4 |  | 143.5 |  |  | 19.0 |  | 506.8 |  |  | 21.3 |  |  | 520.1 |  |  | 22.4 |
CenturyLink, Inc.(1) | 118.8 |  |  | 14.0 |  | 146.1 |  |  | 19.3 |  | 316.0 |  |  | 13.3 |  |  | 457.6 |  |  | 19.7 |
Total other customers combined | 214.4 |  |  | 25.3 |  | 221.0 |  |  | 29.2 |  | 606.1 |  |  | 25.5 |  | 648.3 |  |  | 27.9
Total contract revenues | $ | 848.2 |  |  | 100.0% |  | $ | 756.2 |  |  | 100.0% |  | $ | 2,379.1 |  |  | 100.0 | % |  | $ | 2,322.7 |  |  | 100.0 | %
(1) For comparison purposes in the table above, amounts from CenturyLink, Inc. and Level 3 Communications, Inc. have been combined for periods prior to their November 2017 merger.

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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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