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Customer Concentration and Revenue Information - Revenue Concentration Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 25, 2020 | Jul. 27, 2019 | Jul. 25, 2020 | Jul. 27, 2019
Concentration Risk |  |  |  |
Contract revenues | $ 823,921 | $ 884,221 | $ 1,638,244 | $ 1,717,964
% of Total | 100.00% | 100.00% | 100.00% | 100.00%
Revenue Benchmark | Customer Concentration Risk |  |  |  |
Concentration Risk |  |  |  |
% of Total |  |  | 10.00% |
Revenue Benchmark | Customer Concentration Risk | Five Unnamed Customers |  |  |  |
Concentration Risk |  |  |  |
% of Total |  |  | 77.50% | 79.40%
Revenue Benchmark | Customer Concentration Risk | Verizon Communications Inc. |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 163,000 | $ 205,000 | $ 339,100 | $ 384,800
% of Total | 19.80% | 23.20% | 20.70% | 22.40%
Revenue Benchmark | Customer Concentration Risk | CenturyLink, Inc. |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 158,400 | $ 138,700 | $ 307,100 | $ 248,500
% of Total | 19.20% | 15.70% | 18.70% | 14.50%
Revenue Benchmark | Customer Concentration Risk | AT&T Inc. |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 134,600 | $ 183,300 | $ 288,600 | $ 392,500
% of Total | 16.30% | 20.70% | 17.60% | 22.80%
Revenue Benchmark | Customer Concentration Risk | Comcast Corporation |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 131,400 | $ 133,200 | $ 249,300 | $ 270,300
% of Total | 15.90% | 15.10% | 15.20% | 15.70%
Revenue Benchmark | Customer Concentration Risk | Total other customers combined |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 236,500 | $ 224,000 | $ 454,100 | $ 421,900
% of Total | 28.70% | 25.30% | 27.70% | 24.60%

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