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Accounts Receivable, Contract Assets, and Contract Liabilities - Customer Credit Concentration (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2021 | Jul. 25, 2020 | Jul. 31, 2021 | Jul. 25, 2020 | Jan. 30, 2021
Concentration Risk |  |  |  |  |
Amount | $ 929,120 |  | $ 929,120 |  | $ 858,123
% 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 | $ 333,700 |  | $ 333,700 |  | $ 389,900
% of Total |  |  | 30.90% |  | 37.40%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Lumen Technologies |  |  |  |  |
Concentration Risk |  |  |  |  |
Amount | 163,400 |  | $ 163,400 |  | $ 173,500
% of Total |  |  | 15.10% |  | 16.60%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Comcast Corporation |  |  |  |  |
Concentration Risk |  |  |  |  |
Amount | $ 131,500 |  | $ 131,500 |  | $ 131,700
% of Total |  |  | 12.20% |  | 12.60%

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