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Customer Concentration and Revenue Information - Contract Revenues by Customer Type (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%
Revenue Benchmark | Customer Concentration Risk
Concentration Risk [Line Items]
Amount	$ 4,702,000	$ 4,175,600	$ 3,808,500
Concentration risk, percentage	100.00%	100.00%	100.00%
Revenue Benchmark | Customer Concentration Risk | AT&T Inc.
Concentration Risk [Line Items]
Amount	$ 942,800	$ 706,500	$ 958,000
Concentration risk, percentage	20.10%	16.90%	25.20%
Revenue Benchmark | Customer Concentration Risk | Lumen Technologies
Concentration Risk [Line Items]
Amount	$ 570,400	$ 650,600	$ 483,500
Concentration risk, percentage	12.10%	15.60%	12.70%
Revenue Benchmark | Customer Concentration Risk | Comcast Corporation
Concentration Risk [Line Items]
Amount	$ 401,600	$ 448,600	$ 430,600
Concentration risk, percentage	8.50%	10.70%	11.30%
Revenue Benchmark | Customer Concentration Risk | Total other customers combined
Concentration Risk [Line Items]
Amount	$ 2,787,200	$ 2,369,900	$ 1,936,400
Concentration risk, percentage	59.30%	56.80%	50.80%

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