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Customer Concentration and Revenue Information (Tables) | 12 Months Ended
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Jan. 30, 2021
Risks and Uncertainties [Abstract] |
Customer Credit Concentration | Customers whose combined amounts of accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of January 30, 2021 or January 25, 2020 were as follows (dollars in millions):
| January 30, 2021 |  | January 25, 2020
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 389.9 |  |  | 37.4 | % |  | $ | 440.2 |  |  | 41.8 | %
Lumen Technologies (1) | $ | 173.5 |  |  | 16.6 | % |  | $ | 175.8 |  |  | 16.7 | %
Comcast Corporation | $ | 131.7 |  |  | 12.6 | % |  | $ | 114.0 |  |  | 10.8 | %
(1) Formerly known as CenturyLink, Inc. Customers whose contract revenues exceeded 10% of total contract revenues during fiscal 2021, fiscal 2020, and fiscal 2019, as well as total contract revenues from all other customers combined, were as follows:
| Fiscal Year Ended |
| January 30, 2021 |  | January 25, 2020 |  | January 26, 2019 |
| Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total |
Verizon Communications Inc. | $ | 601.6 |  | 18.8 | % |  | $ | 728.2 |  | 21.8 | % |  | $ | 599.8 |  | 19.2 | % |
Lumen Technologies (1) | 542.0 |  | 16.9 | % |  | 547.8 |  | 16.4 | % |  | 425.6 |  | 13.6 | % |
Comcast Corporation | 533.9 |  | 16.7 | % |  | 503.2 |  | 15.1 | % |  | 650.2 |  | 20.8 | % |
AT&T Inc. | 533.7 |  | 16.7 | % |  | 687.9 |  | 20.6 | % |  | 664.2 |  | 21.2 | % |
Total other customers combined | 988.0 |  | 30.9 | % |  | 872.6 |  | 26.1 | % |  | 787.9 |  | 25.2 | % |
Total contract revenues | $ | 3,199.2 |  | 100.0% |  | $ | 3,339.7 |  | 100.0% |  | $3,127.7 | 100.0% |
(1) Formerly known as CenturyLink, Inc. Total contract revenues by customer type during fiscal 2021, fiscal 2020, and fiscal 2019, were as follows (dollars in millions):
| Fiscal Year Ended |
| January 30, 2021 |  | January 25, 2020 |  | January 26, 2019 |
| Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total |
Telecommunications | $ | 2,851.6 |  | 89.1% |  | $ | 3,031.9 |  | 90.8% |  | $ | 2,855.8 |  | 91.3% |
Underground facility locating | 229.6 |  | 7.2% |  | 204.5 |  | 6.1% |  | 182.7 |  | 5.8% |
Electrical and gas utilities and other | 118.0 |  | 3.7% |  | 103.3 |  | 3.1% |  | 89.2 |  | 2.9% |
Total contract revenues | $ | 3,199.2 |  | 100.0% |  | $ | 3,339.7 |  | 100.0% |  | $ | 3,127.7 |  | 100.0% |

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