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Concentration of Credit Risk (Tables) | 3 Months Ended
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Apr. 27, 2019
Risks and Uncertainties [Abstract] |
Schedule that Represents A Significant Portion of the Company’s Customer Base and Each Over 10% of Total Revenue | 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 27, 2019 or January 26, 2019 were as follows (dollars in millions):
| April 27, 2019 |  | January 26, 2019
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 390.3 |  |  | 39.6% |  | $ | 298.4 |  |  | 36.2%
CenturyLink, Inc. | $ | 152.7 |  |  | 15.5% |  | $ | 147.2 |  |  | 17.9%
Comcast Corporation | $ | 131.1 |  |  | 13.3% |  | $ | 127.2 |  |  | 15.4%
AT&T Inc. | $ | 114.3 |  |  | 11.6% |  | $ | 90.6 |  |  | 11.0%
Total contract revenues by customer type during the three months ended April 27, 2019 and April 28, 2018 were as follows (dollars in millions):
| For the Three Months Ended
| April 27, 2019 |  | April 28, 2018
| Amount |  | % of Total |  | Amount |  | % of Total
Telecommunications | $ | 761.4 |  |  | 91.3% |  | $ | 667.2 |  |  | 91.2%
Underground facility locating | 48.2 |  |  | 5.8 |  | 45.1 |  |  | 6.2
Electrical and gas utilities and other | 24.1 |  |  | 2.9 |  | 19.1 |  |  | 2.6
Total contract revenues | $ | 833.7 |  |  | 100.0% |  | $ | 731.4 |  |  | 100.0%
Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended April 27, 2019 or April 28, 2018, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
| For the Three Months Ended
| April 27, 2019 |  | April 28, 2018
| Amount |  | % of Total |  | Amount |  | % of Total
AT&T Inc. | $ | 209.3 |  |  | 25.1% |  | $ | 177.0 |  |  | 24.2%
Verizon Communications Inc. | 179.8 |  |  | 21.6 |  | 122.1 |  |  | 16.7
Comcast Corporation | 137.1 |  |  | 16.4 |  | 159.2 |  |  | 21.8
CenturyLink, Inc. | 109.8 |  |  | 13.2 |  | 89.7 |  |  | 12.3
Total other customers combined | 197.7 |  |  | 23.7 |  | 183.4 |  |  | 25.0
Total contract revenues | $ | 833.7 |  |  | 100.0% |  | $ | 731.4 |  |  | 100.0%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6442-108592 + Details
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