Customer Concentration and Revenue Information - Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 29, 2022	Oct. 30, 2021	Oct. 29, 2022	Oct. 30, 2021
Concentration Risk
Contract revenues	$ 1,042,423	$ 853,973	$ 2,890,996	$ 2,369,038
Customer Concentration Risk | Revenue Benchmark
Concentration Risk
Contract revenues	$ 1,042,400	$ 854,000	$ 2,891,000	$ 2,369,000
% 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	$ 940,700	$ 757,900	$ 2,590,500	$ 2,095,100
% of Total	90.30%	88.80%	89.60%	88.40%
Customer Concentration Risk | Revenue Benchmark | Underground facility locating
Concentration Risk
Contract revenues	$ 72,100	$ 67,600	$ 214,500	$ 198,200
% of Total	6.90%	7.90%	7.40%	8.40%
Customer Concentration Risk | Revenue Benchmark | Electrical and gas utilities and other
Concentration Risk
Contract revenues	$ 29,600	$ 28,500	$ 86,000	$ 75,700
% of Total	2.80%	3.30%	3.00%	3.20%
Five Unnamed Customers | Customer Concentration Risk | Revenue Benchmark
Concentration Risk
% of Total			67.00%	66.00%