Customer Concentration and Revenue Information - Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2023	Apr. 30, 2022
Concentration Risk
Contract revenues	$ 1,045,474	$ 876,300
Customer Concentration Risk | Revenue Benchmark
Concentration Risk
Contract revenues	$ 1,045,500	$ 876,300
% of Total	100.00%	100.00%
% of Total	100.00%	100.00%
Customer Concentration Risk | Revenue Benchmark | Telecommunications
Concentration Risk
Contract revenues	$ 938,200	$ 778,900
% of Total	89.70%	88.90%
Customer Concentration Risk | Revenue Benchmark | Underground facility locating
Concentration Risk
Contract revenues	$ 73,000	$ 70,900
% of Total	7.00%	8.10%
Customer Concentration Risk | Revenue Benchmark | Electrical and gas utilities and other
Concentration Risk
Contract revenues	$ 34,300	$ 26,500
% of Total	3.30%	3.00%
Five Unnamed Customers | Customer Concentration Risk | Revenue Benchmark
Concentration Risk
% of Total	65.50%	67.30%