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Customer Concentration and Revenue Information - Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 27, 2024	Jul. 29, 2023	Jul. 27, 2024	Jul. 29, 2023
Concentration Risk
Contract revenues	$ 1,203,059	$ 1,041,535	$ 2,345,482	$ 2,087,009
Customer Concentration Risk | Revenue Benchmark
Concentration Risk
Contract revenues	$ 1,203,100	$ 1,041,500	$ 2,345,500	$ 2,087,000
Concentration risk, percentage	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	$ 1,086,200	$ 927,100	$ 2,113,000	$ 1,865,300
Concentration risk, percentage	90.30%	89.00%	90.00%	89.40%
Customer Concentration Risk | Revenue Benchmark | Underground facility locating
Concentration Risk
Contract revenues	$ 82,100	$ 76,700	$ 163,100	$ 149,600
Concentration risk, percentage	6.80%	7.40%	7.00%	7.20%
Customer Concentration Risk | Revenue Benchmark | Electrical and gas utilities and other
Concentration Risk
Contract revenues	$ 34,800	$ 37,700	$ 69,400	$ 72,100
Concentration risk, percentage	2.90%	3.60%	3.00%	3.40%
Five Unnamed Customers | Customer Concentration Risk | Revenue Benchmark
Concentration Risk
Concentration risk, percentage			55.50%	61.50%

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Concentration Risk, Threshold Percentage

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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