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Customer Concentration and Revenue Information (Tables) | 9 Months Ended
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Oct. 30, 2021
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 October 30, 2021 or January 30, 2021 were as follows (dollars in millions):
| October 30, 2021 |  | January 30, 2021
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 233.5 |  |  | 22.1% |  | $ | 389.9 |  |  | 37.4%
Lumen Technologies(1) | $ | 177.4 |  |  | 16.8% |  | $ | 173.5 |  |  | 16.6%
Comcast Corporation | $ | 131.5 |  |  | 12.4% |  | $ | 131.7 |  |  | 12.6%
AT&T Inc. | $ | 107.0 |  |  | 10.1% |  | $ | 71.7 |  |  | 6.9%
Customers whose contract revenues exceeded 10% of total contract revenues during the three and nine months ended October 30, 2021 or October 24, 2020, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
| For the Three Months Ended |  | For the Nine Months Ended |
| October 30, 2021 |  | October 24, 2020 |  | October 30, 2021 |  | October 24, 2020 |
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |
AT&T Inc. | $ | 199.5 |  |  | 23.4% |  | $ | 118.9 |  |  | 14.7% |  | $ | 532.6 |  |  | 22.5% |  | $ | 407.5 |  |  | 16.6% |
Comcast Corporation | 121.0 |  |  | 14.2 |  | 143.6 |  |  | 17.7 |  | 373.8 |  |  | 15.8 |  | 393.0 |  |  | 16.0 |
Lumen Technologies(1) | 103.0 |  |  | 12.1 |  | 134.4 |  |  | 16.6 |  | 284.2 |  |  | 12.0 |  | 441.5 |  |  | 18.0 |
Verizon Communications Inc. | 93.4 |  |  | 10.9 |  | 144.8 |  | 17.9 |  | 275.7 |  |  | 11.6 |  | 483.8 |  | 19.8 |
Total other customers combined | 337.1 |  |  | 39.5 |  | 268.6 |  | 33.1 |  | 902.7 |  |  | 38.1 |  | 722.7 |  | 29.5 |
Total contract revenues | $ | 854.0 |  |  | 100.0% |  | $ | 810.3 |  |  | 100.0% |  | $ | 2,369.0 |  |  | 100.0% |  | $ | 2,448.5 |  |  | 100.0% |
Total contract revenues by customer type during the three and nine months ended October 30, 2021 and October 24, 2020 were as follows (dollars in millions):
| For the Three Months Ended |  | For the Nine Months Ended |
| October 30, 2021 |  | October 24, 2020 |  | October 30, 2021 |  | October 24, 2020 |
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |
Telecommunications | $ | 757.9 |  |  | 88.8% |  | $ | 721.2 |  |  | 89.0% |  | $ | 2,095.1 |  |  | 88.4% |  | $ | 2,193.9 |  |  | 89.6% |
Underground facility locating | 67.6 |  |  | 7.9 |  | 59.0 |  |  | 7.3 |  | 198.2 |  |  | 8.4 |  | 171.3 |  |  | 7.0 |
Electrical and gas utilities and other | 28.5 |  |  | 3.3 |  | 30.1 |  |  | 3.7 |  | 75.7 |  |  | 3.2 |  | 83.3 |  |  | 3.4 |
Total contract revenues | $ | 854.0 |  |  | 100.0% |  | $ | 810.3 |  |  | 100.0% |  | $ | 2,369.0 |  |  | 100.0% |  | $ | 2,448.5 |  |  | 100.0% |

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