Customer Concentration and Revenue Information - Revenue Concentration Risk (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 30, 2022	Jul. 31, 2021	Jul. 30, 2022	Jul. 31, 2021
Concentration Risk
Contract revenues	$ 972,273	$ 787,568	$ 1,848,573	$ 1,515,065
Revenue Benchmark | Customer Concentration Risk
Concentration Risk
Contract revenues	$ 972,300	$ 787,600	$ 1,848,600	$ 1,515,100
% of Total	100.00%	100.00%	100.00%	100.00%
Revenue Benchmark | Customer Concentration Risk | AT&T Inc.
Concentration Risk
Contract revenues	$ 255,900	$ 177,500	$ 493,300	$ 333,100
% of Total	26.30%	22.50%	26.70%	22.00%
Revenue Benchmark | Customer Concentration Risk | Lumen Technologies
Concentration Risk
Contract revenues	$ 127,600	$ 95,400	$ 230,400	$ 181,200
% of Total	13.10%	12.10%	12.50%	12.00%
Revenue Benchmark | Customer Concentration Risk | Comcast Corporation
Concentration Risk
Contract revenues	$ 111,800	$ 121,700	$ 223,000	$ 252,800
% of Total	11.50%	15.50%	12.10%	16.70%
Revenue Benchmark | Customer Concentration Risk | Verizon Communications Inc.
Concentration Risk
Contract revenues	$ 80,800	$ 90,800	$ 161,800	$ 182,300
% of Total	8.30%	11.50%	8.80%	12.00%
Revenue Benchmark | Customer Concentration Risk | Total other customers combined
Concentration Risk
Contract revenues	$ 396,200	$ 302,200	$ 740,100	$ 565,700
% of Total	40.80%	38.40%	40.00%	37.30%