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Concentration of Credit Risk - Revenue Concentration Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 26, 2019 | Oct. 27, 2018 | Oct. 26, 2019 | Oct. 27, 2018
Concentration Risk |  |  |  |
Contract revenues | $ 884,115 | $ 848,237 | $ 2,602,079 | $ 2,379,081
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 |  |  | 78.70% | 78.30%
Sales Revenue, Services, Net | Customer Concentration Risk | CenturyLink, Inc. |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 162,900 | $ 164,600 | $ 555,400 | $ 506,800
Concentration risk percentage | 18.40% | 19.40% | 21.30% | 21.30%
Sales Revenue, Services, Net | Customer Concentration Risk | Verizon Communications Inc. |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 131,300 | $ 176,300 | $ 401,600 | $ 506,700
Concentration risk percentage | 14.90% | 20.80% | 15.40% | 21.30%
Sales Revenue, Services, Net | Customer Concentration Risk | AT&T Inc. |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 182,100 | $ 174,100 | $ 566,900 | $ 443,500
Concentration risk percentage | 20.60% | 20.50% | 21.80% | 18.60%
Sales Revenue, Services, Net | Customer Concentration Risk | Comcast Corporation |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 164,100 | $ 118,800 | $ 412,700 | $ 316,000
Concentration risk percentage | 18.60% | 14.00% | 15.90% | 13.30%
Sales Revenue, Services, Net | Customer Concentration Risk | Total other customers combined |  |  |  |
Concentration Risk |  |  |  |
Contract revenues | $ 243,700 | $ 214,400 | $ 665,500 | $ 606,100
Concentration risk percentage | 27.50% | 25.30% | 25.60% | 25.50%

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