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Accounts Receivable (Tables) | 3 Months Ended
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Apr. 28, 2018
Receivables [Abstract] |
Schedule of Accounts Receivable | Accounts receivable consisted of the following (dollars in thousands):
| April 28, 2018 |  | January 27, 2018
Trade accounts receivable | $ | 309,724 |  |  | $ | 300,271 |
Unbilled accounts receivable | 318,007 |  |  | — |
Retainage | 18,225 |  |  | 19,411 |
Total | 645,956 |  |  | 319,682 |
Less: allowance for doubtful accounts | (976 | ) |  | (998 | )
Accounts receivable, net | $ | 644,980 |  |  | $ | 318,684 |
Contract with Customer, Asset and Liability | Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
| April 28, 2018 |  | January 27, 2018
Contract assets | $ | 101,163 |  |  | $ | 369,472 |
Contract liabilities | 5,730 |  |  | 6,480 |
Contract assets, net | $ | 95,433 |  |  | $ | 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 April 28, 2018 or January 27, 2018 were as follows (dollars in millions):
| April 28, 2018 |  | January 27, 2018
| Amount |  | % of Total |  | Amount |  | % of Total
Comcast Corporation | $ | 164.2 |  |  | 22.2% |  | $ | 166.5 |  |  | 24.5%
Verizon Communications Inc. | $ | 156.5 |  |  | 21.1% |  | $ | 98.2 |  |  | 14.4%
CenturyLink, Inc. | $ | 120.3 |  |  | 16.3% |  | $ | 126.0 |  |  | 18.5%
AT&T Inc. | $ | 102.8 |  |  | 13.9% |  | $ | 79.2 |  |  | 11.6%
Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended April 28, 2018 or April 29, 2017, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
| For the Three Months Ended
| April 28, 2018 |  | April 29, 2017
| Amount |  | % of Total |  | Amount |  | % of Total
AT&T Inc. | $ | 177.0 |  |  | 24.2% |  | $ | 213.1 |  |  | 27.1%
Comcast Corporation | 159.2 |  |  | 21.8 |  | 152.9 |  |  | 19.4
Verizon Communications Inc. | 122.1 |  |  | 16.7 |  | 66.8 |  |  | 8.5
CenturyLink, Inc.(1) | 89.7 |  |  | 12.3 |  | 146.2 |  |  | 18.6
Total other customers combined | 183.4 |  |  | 25.0 |  | 207.3 |  |  | 26.4
Total contract revenues | $ | 731.4 |  |  | 100.0% |  | $ | 786.3 |  |  | 100.0%
Total contract revenues by customer type during the three months ended April 28, 2018 and April 29, 2017 were as follows (dollars in millions):
| For the Three Months Ended
| April 28, 2018 |  | April 29, 2017
| Amount |  | % of Total |  | Amount |  | % of Total
Telecommunications | $ | 667.2 |  |  | 91.2% |  | $ | 725.3 |  |  | 92.2%
Underground facility locating | 45.1 |  |  | 6.2 |  | 42.1 |  |  | 5.4
Electrical and gas utilities and other | 19.1 |  |  | 2.6 |  | 18.9 |  |  | 2.4
Total contract revenues | $ | 731.4 |  |  | 100.0% |  | $ | 786.3 |  |  | 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://www.xbrl.org/2003/role/presentationRef -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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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6442-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6327-108592 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 + Details
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