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Customer Concentration and Revenue Information (Tables) | 6 Months Ended
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Jul. 31, 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 July 31, 2021 or January 30, 2021 were as follows (dollars in millions):
| July 31, 2021 |  | January 30, 2021
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 333.7 |  |  | 30.9% |  | $ | 389.9 |  |  | 37.4%
Lumen Technologies(1) | $ | 163.4 |  |  | 15.1% |  | $ | 173.5 |  |  | 16.6%
Comcast Corporation | $ | 131.5 |  |  | 12.2% |  | $ | 131.7 |  |  | 12.6%
Customers whose contract revenues exceeded 10% of total contract revenues during the three and six months ended July 31, 2021 or July 25, 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 Six Months Ended |
| July 31, 2021 |  | July 25, 2020 |  | July 31, 2021 |  | July 25, 2020 |
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |
AT&T Inc. | $ | 177.5 |  |  | 22.5% |  | $ | 134.6 |  |  | 16.3% |  | $ | 333.1 |  |  | 22.0% |  | $ | 288.6 |  |  | 17.6% |
Comcast Corporation | 121.7 |  |  | 15.5 |  | 131.4 |  |  | 15.9 |  | 252.8 |  |  | 16.7 |  | 249.3 |  |  | 15.2 |
Verizon Communications Inc. | 90.8 |  |  | 11.5 |  | 163.0 |  | 19.8 |  | 182.3 |  |  | 12.0 |  | 339.1 |  | 20.7 |
Lumen Technologies(1) | 95.4 |  |  | 12.1 |  | 158.4 |  |  | 19.2 |  | 181.2 |  |  | 12.0 |  | 307.1 |  |  | 18.7 |
Total other customers combined | 302.2 |  |  | 38.4 |  | 236.5 |  | 28.7 |  | 565.7 |  |  | 37.3 |  | 454.1 |  | 27.7 |
Total contract revenues | $ | 787.6 |  |  | 100.0% |  | $ | 823.9 |  |  | 100.0% |  | $ | 1,515.1 |  |  | 100.0% |  | $ | 1,638.2 |  |  | 100.0% |
Total contract revenues by customer type during the three and six months ended July 31, 2021 and July 25, 2020 were as follows (dollars in millions):
| For the Three Months Ended |  | For the Six Months Ended |
| July 31, 2021 |  | July 25, 2020 |  | July 31, 2021 |  | July 25, 2020 |
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |
Telecommunications | $ | 697.5 |  |  | 88.6% |  | $ | 746.7 |  |  | 90.6% |  | $ | 1,337.2 |  |  | 88.3% |  | $ | 1,472.7 |  |  | 89.9% |
Underground facility locating | 65.8 |  |  | 8.3 |  | 58.9 |  |  | 7.2 |  | 130.7 |  |  | 8.6 |  | 112.3 |  |  | 6.9 |
Electrical and gas utilities and other | 24.3 |  |  | 3.1 |  | 18.3 |  |  | 2.2 |  | 47.2 |  |  | 3.1 |  | 53.2 |  |  | 3.2 |
Total contract revenues | $ | 787.6 |  |  | 100.0% |  | $ | 823.9 |  |  | 100.0% |  | $ | 1,515.1 |  |  | 100.0% |  | $ | 1,638.2 |  |  | 100.0% |

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