Customer Concentration and Revenue Information - Revenue Concentration Risk (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 30, 2021	Oct. 24, 2020	Oct. 30, 2021	Oct. 24, 2020
Concentration Risk
Contract revenues	$ 853,973	$ 810,256	$ 2,369,038	$ 2,448,500
Revenue Benchmark | Customer Concentration Risk
Concentration Risk
Contract revenues	$ 854,000	$ 810,300	$ 2,369,000	$ 2,448,500
% of Total	100.00%	100.00%	100.00%	100.00%
Revenue Benchmark | Customer Concentration Risk | AT&T Inc.
Concentration Risk
Contract revenues	$ 199,500	$ 118,900	$ 532,600	$ 407,500
% of Total	23.40%	14.70%	22.50%	16.60%
Revenue Benchmark | Customer Concentration Risk | Comcast Corporation
Concentration Risk
Contract revenues	$ 121,000	$ 143,600	$ 373,800	$ 393,000
% of Total	14.20%	17.70%	15.80%	16.00%
Revenue Benchmark | Customer Concentration Risk | Lumen Technologies
Concentration Risk
Contract revenues	$ 103,000	$ 134,400	$ 284,200	$ 441,500
% of Total	12.10%	16.60%	12.00%	18.00%
Revenue Benchmark | Customer Concentration Risk | Verizon Communications Inc.
Concentration Risk
Contract revenues	$ 93,400	$ 144,800	$ 275,700	$ 483,800
% of Total	10.90%	17.90%	11.60%	19.80%
Revenue Benchmark | Customer Concentration Risk | Total other customers combined
Concentration Risk
Contract revenues	$ 337,100	$ 268,600	$ 902,700	$ 722,700
% of Total	39.50%	33.10%	38.10%	29.50%