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Concentration of Credit Risk (Tables) | 6 Months Ended
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Jul. 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 accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of July 27, 2019 or January 26, 2019 were as follows (dollars in millions):
| July 27, 2019 |  | January 26, 2019
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 481.8 |  |  | 42.3% |  | $ | 298.4 |  |  | 36.2%
CenturyLink, Inc. | $ | 171.4 |  |  | 15.0% |  | $ | 147.2 |  |  | 17.9%
Comcast Corporation | $ | 142.9 |  |  | 12.5% |  | $ | 127.2 |  |  | 15.4%
AT&T Inc. | $ | 112.3 |  |  | 9.8% |  | $ | 90.6 |  |  | 11.0%
Total contract revenues by customer type during the three and six months ended July 27, 2019 and July 28, 2018 were as follows (dollars in millions):
| For the Three Months Ended |  | For the Six Months Ended
| July 27, 2019 |  | July 28, 2018 |  | July 27, 2019 |  | July 28, 2018
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Telecommunications | $ | 804.4 |  |  | 91.0% |  | $ | 726.7 |  |  | 90.9% |  | $ | 1,565.8 |  |  | 91.2% |  | $ | 1,393.9 |  |  | 91.1%
Underground facility locating | 53.8 |  |  | 6.1 |  | 49.0 |  |  | 6.1 |  | 102.0 |  |  | 5.9 |  | 94.1 |  |  | 6.1
Electrical and gas utilities and other | 26.0 |  |  | 2.9 |  | 23.8 |  |  | 3.0 |  | 50.2 |  |  | 2.9 |  | 42.8 |  |  | 2.8
Total contract revenues | $ | 884.2 |  |  | 100.0% |  | $ | 799.5 |  |  | 100.0% |  | $ | 1,718.0 |  |  | 100.0% |  | $ | 1,530.8 |  |  | 100.0%
Customers whose contract revenues exceeded 10% of total contract revenues during the three or six months ended July 27, 2019 or July 28, 2018, 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 27, 2019 |  | July 28, 2018 |  | July 27, 2019 |  | July 28, 2018
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 205.0 |  |  | 23.2% |  | $ | 147.3 |  |  | 18.4% |  | $ | 384.8 |  |  | 22.4% |  | $ | 269.5 |  |  | 17.6%
AT&T Inc. | 183.3 |  |  | 20.7 |  | 165.2 |  |  | 20.7 |  | 392.5 |  |  | 22.8 |  | 342.2 |  |  | 22.4
CenturyLink, Inc. | 138.7 |  |  | 15.7 |  | 107.6 |  |  | 13.5 |  | 248.5 |  |  | 14.5 |  | 197.2 |  |  | 12.9
Comcast Corporation | 133.2 |  |  | 15.1 |  | 171.2 |  |  | 21.4 |  | 270.3 |  |  | 15.7 |  | 330.3 |  |  | 21.6
Total other customers combined | 224.0 |  |  | 25.3 |  | 208.2 |  |  | 26.0 |  | 421.9 |  |  | 24.6 |  | 391.6 |  |  | 25.5
Total contract revenues | $ | 884.2 |  |  | 100.0% |  | $ | 799.5 |  |  | 100.0% |  | $ | 1,718.0 |  |  | 100.0% |  | $ | 1,530.8 |  |  | 100.0%

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