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Concentration of Credit Risk (Tables) | 12 Months Ended
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Jan. 26, 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 January 26, 2019 or January 27, 2018 were as follows (dollars in millions):
| January 26, 2019 |  | January 27, 2018
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 298.4 |  |  | 36.2% |  | $ | 98.2 |  |  | 14.4%
CenturyLink, Inc. | $ | 147.2 |  |  | 17.9% |  | $ | 126.0 |  |  | 18.5%
Comcast Corporation | $ | 127.2 |  |  | 15.4% |  | $ | 166.5 |  |  | 24.5%
AT&T Inc. | $ | 90.6 |  |  | 11.0% |  | $ | 79.2 |  |  | 11.6%
Total contract revenues by customer type during fiscal 2019, the 2018 transition period, fiscal 2017, and fiscal 2016 were as follows (dollars in millions):
| Fiscal Year Ended |  | Six Months Ended |  | Fiscal Year Ended
| January 26, 2019 |  | January 27, 2018 |  | July 29, 2017 |  | July 30, 2016
| Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total
Telecommunications | $ | 2,855.8 |  | 91.3% |  | $ | 1,284.1 |  | 91.0% |  | $ | 2,819.9 |  | 91.9% |  | $ | 2,424.2 |  | 90.7%
Underground facility locating | $ | 182.7 |  | 5.8% |  | $ | 88.6 |  | 6.3% |  | $ | 167.9 |  | 5.5% |  | $ | 156.7 |  | 5.9%
Electrical and gas utilities and other | $ | 89.2 |  | 2.9% |  | $ | 38.6 |  | 2.7% |  | $ | 79.1 |  | 2.6% |  | $ | 91.6 |  | 3.4%
Total contract revenues | $ | 3,127.7 |  | 100% |  | $ | 1,411.3 |  | 100% |  | $ | 3,066.9 |  | 100% |  | $ | 2,672.5 |  | 100%
Customers whose contract revenues exceeded 10% of total contract revenues during fiscal 2019, the 2018 transition period, fiscal 2017, or fiscal 2016, as well as total contract revenues from all other customers combined, were as follows:
| Fiscal Year Ended |  | Six Months Ended |  | Fiscal Year Ended
| January 26, 2019 |  | January 27, 2018 |  | July 29, 2017 |  | July 30, 2016
| Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total
AT&T Inc. | 664.2 | 21.2% |  | 290.1 | 20.6% |  | 806.7 | 26.3% |  | 650.9 | 24.4%
Comcast Corporation | 650.2 | 20.8% |  | 304.4 | 21.6% |  | 543.6 | 17.7% |  | 363.1 | 13.6%
Verizon Communications Inc.(1) | 599.8 | 19.2% |  | 168.7 | 12.0% |  | 282.7 | 9.2% |  | 298.2 | 11.2%
Century Link, Inc.(2) | 425.6 | 13.6% |  | 247.0 | 17.5% |  | 556.8 | 18.2% |  | 394.0 | 14.7%
Total other customers combined | 787.9 | 25.2% |  | 401.1 | 28.3% |  | 877.1 | 28.6% |  | 966.3 | 36.1%
Total contract revenues | $ | 3,127.7 |  | 100.0% |  | 1,411.3 | 100% |  | 3,066.9 | 100.0% |  | 2,672.5 | 100%
(1) For comparison purposes in the table above, amounts from Verizon Communications Inc. and XO Communications LLC’s fiber-optic network business have been combined for periods prior to their February 2017 merger. (2) 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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