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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. 25, 2020 | Jul. 27, 2019 | Jul. 25, 2020 | Jul. 27, 2019 | Jan. 25, 2020
Concentration Risk |  |  |  |  |
Amount | $ 897,833 |  | $ 897,833 |  | $ 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 | $ 462,300 |  | $ 462,300 |  | $ 440,200
% of Total |  |  | 40.70% |  | 41.80%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | CenturyLink, Inc. |  |  |  |  |
Concentration Risk |  |  |  |  |
Amount | 204,100 |  | $ 204,100 |  | $ 175,800
% of Total |  |  | 18.00% |  | 16.70%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Comcast Corporation |  |  |  |  |
Concentration Risk |  |  |  |  |
Amount | $ 142,700 |  | $ 142,700 |  | $ 114,000
% of Total |  |  | 12.60% |  | 10.80%

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