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Customer Concentration and Revenue Information - Trade Receivable Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 25, 2025	Jan. 27, 2024	Jan. 28, 2023
Concentration Risk [Line Items]
Amount	$ 4,702,014	$ 4,175,574	$ 3,808,462
Concentration risk, percentage	100.00%	100.00%	100.00%
Customer Concentration Risk | Revenue Benchmark
Concentration Risk [Line Items]
Amount	$ 4,702,000	$ 4,175,600	$ 3,808,500
Concentration risk, percentage	100.00%	100.00%	100.00%
Telecommunications | Customer Concentration Risk | Revenue Benchmark
Concentration Risk [Line Items]
Amount	$ 4,250,200	$ 3,743,300	$ 3,415,800
Concentration risk, percentage	90.40%	89.60%	89.70%
Underground facility locating | Customer Concentration Risk | Revenue Benchmark
Concentration Risk [Line Items]
Amount	$ 314,700	$ 295,300	$ 274,900
Concentration risk, percentage	6.70%	7.10%	7.20%
Electrical and gas utilities and other | Customer Concentration Risk | Revenue Benchmark
Concentration Risk [Line Items]
Amount	$ 137,100	$ 137,000	$ 117,800
Concentration risk, percentage	2.90%	3.30%	3.10%

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