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Accounts Receivable Concentration Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 26, 2019 | Oct. 27, 2018 | Oct. 26, 2019 | Oct. 27, 2018 | Jan. 26, 2019
Concentration Risk |  |  |  |  |
Accounts receivable, net | $ 919,496 |  | $ 919,496 |  | $ 625,258
Concentration risk percentage | 100.00% | 100.00% | 100.00% | 100.00% |
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Verizon Communications Inc. |  |  |  |  |
Concentration Risk |  |  |  |  |
Accounts receivable, net | $ 160,200 |  | $ 160,200 |  | $ 127,200
Concentration risk percentage |  |  | 12.90% |  | 15.40%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | AT&T Inc. |  |  |  |  |
Concentration Risk |  |  |  |  |
Accounts receivable, net | 511,300 |  | $ 511,300 |  | $ 298,400
Concentration risk percentage |  |  | 41.10% |  | 36.20%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Comcast Corporation |  |  |  |  |
Concentration Risk |  |  |  |  |
Accounts receivable, net | 200,900 |  | $ 200,900 |  | $ 147,200
Concentration risk percentage |  |  | 16.10% |  | 17.90%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | AT&T Inc. |  |  |  |  |
Concentration Risk |  |  |  |  |
Accounts receivable, net | $ 111,300 |  | $ 111,300 |  | $ 90,600
Concentration risk percentage |  |  | 8.90% |  | 11.00%

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