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Customer Concentration and Revenue Information - Trade Receivable Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 29, 2022 | Oct. 30, 2021 | Jul. 31, 2021 | May 01, 2021 | Jan. 30, 2021 | Oct. 24, 2020 | Jul. 25, 2020 | Apr. 25, 2020 | Jan. 29, 2022 | Jan. 30, 2021 | Jan. 25, 2020
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount | $ 761,481 | $ 853,973 | $ 787,568 | $ 727,497 | $ 750,665 | $ 810,256 | $ 823,921 | $ 814,322 | $ 3,130,519 | $ 3,199,165 | $ 3,339,682
% of Total |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Customer Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 3,130,500 | $ 3,199,200 | $ 3,339,700
% of Total |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Telecommunications | Customer Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 2,777,600 | $ 2,851,600 | $ 3,031,900
% of Total |  |  |  |  |  |  |  |  | 88.70% | 89.10% | 90.80%
Underground facility locating | Customer Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 255,400 | $ 229,600 | $ 204,500
% of Total |  |  |  |  |  |  |  |  | 8.20% | 7.20% | 6.10%
Electrical and gas utilities and other | Customer Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 97,500 | $ 118,000 | $ 103,300
% of Total |  |  |  |  |  |  |  |  | 3.10% | 3.70% | 3.10%

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