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Concentration of Credit Risk - Revenue Concentration Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 27, 2019 | Jul. 28, 2018 | Jul. 27, 2019 | Jul. 28, 2018
Concentration Risk |  |  |  |
Contract revenues | $ 884,221 | $ 799,470 | $ 1,717,964 | $ 1,530,844
Concentration risk percentage | 100.00% | 100.00% | 100.00% | 100.00%
Sales Revenue, Services, Net | Customer Concentration Risk |  |  |  |
Concentration Risk |  |  |  |
Concentration risk percentage |  |  | 10.00% |
Sales Revenue, Services, Net | Customer Concentration Risk | Five Unnamed Customers |  |  |  |
Concentration Risk |  |  |  |
Concentration risk percentage |  |  | 79.40% | 78.30%
Sales Revenue, Services, Net | Customer Concentration Risk | AT&T Inc. |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 183,300 | $ 165,200 | $ 392,500 | $ 342,200
Concentration risk percentage | 20.70% | 20.70% | 22.80% | 22.40%
Sales Revenue, Services, Net | Customer Concentration Risk | Verizon Communications Inc. |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 133,200 | $ 171,200 | $ 270,300 | $ 330,300
Concentration risk percentage | 15.10% | 21.40% | 15.70% | 21.60%
Sales Revenue, Services, Net | Customer Concentration Risk | CenturyLink, Inc. |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 205,000 | $ 147,300 | $ 384,800 | $ 269,500
Concentration risk percentage | 23.20% | 18.40% | 22.40% | 17.60%
Sales Revenue, Services, Net | Customer Concentration Risk | Comcast Corporation |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 138,700 | $ 107,600 | $ 248,500 | $ 197,200
Concentration risk percentage | 15.70% | 13.50% | 14.50% | 12.90%
Sales Revenue, Services, Net | Customer Concentration Risk | Total other customers combined |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 224,000 | $ 208,200 | $ 421,900 | $ 391,600
Concentration risk percentage | 25.30% | 26.00% | 24.60% | 25.50%

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