Customer Concentration and Revenue Information - Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 28, 2023	Oct. 29, 2022
Concentration Risk
Contract revenues	$ 1,136,110	$ 1,042,423	$ 3,223,119	$ 2,890,996
Customer Concentration Risk | Revenue Benchmark
Concentration Risk
Contract revenues	$ 1,136,100	$ 1,042,400	$ 3,223,100	$ 2,891,000
% of Total	100.00%	100.00%	100.00%	100.00%
% of Total	100.00%	100.00%	100.00%	100.00%
Customer Concentration Risk | Revenue Benchmark | Telecommunications
Concentration Risk
Contract revenues	$ 1,023,200	$ 940,700	$ 2,888,500	$ 2,590,500
% of Total	90.10%	90.30%	89.60%	89.60%
Customer Concentration Risk | Revenue Benchmark | Underground facility locating
Concentration Risk
Contract revenues	$ 76,900	$ 72,100	$ 226,600	$ 214,500
% of Total	6.70%	6.90%	7.00%	7.40%
Customer Concentration Risk | Revenue Benchmark | Electrical and gas utilities and other
Concentration Risk
Contract revenues	$ 36,000	$ 29,600	$ 108,000	$ 86,000
% of Total	3.20%	2.80%	3.40%	3.00%
Five Unnamed Customers | Customer Concentration Risk | Revenue Benchmark
Concentration Risk
% of Total			57.90%	67.00%