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Accounts Receivable, Contract Assets, and Contract Liabilities - Customer Credit Concentration (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 24, 2020 | Apr. 25, 2020 | Oct. 26, 2019 | Oct. 24, 2020 | Oct. 26, 2019 | Jan. 25, 2020
Concentration Risk |  |  |  |  |  |
Amount | $ 938,941 |  |  | $ 938,941 |  | $ 817,245
% of Total | 100.00% |  | 100.00% | 100.00% | 100.00% |
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Verizon Communications Inc. |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |
Amount | $ 415,600 |  |  | $ 415,600 |  | 440,200
% of Total |  | 41.80% |  | 36.90% |  |
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Lumen Technologies(1) |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |
Amount | 198,900 |  |  | $ 198,900 |  | 175,800
% of Total |  | 16.70% |  | 17.60% |  |
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Comcast Corporation |  |  |  |  |  |
Concentration Risk |  |  |  |  |  |
Amount | $ 156,200 |  |  | $ 156,200 |  | $ 114,000
% of Total |  | 10.80% |  | 13.90% |  |

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