Accounts Receivable, Contract Assets, and Contract Liabilities - Customer Credit Concentration (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 29, 2022	Jan. 30, 2021	Jan. 25, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 895,898	$ 858,123
% of Total	100.00%	100.00%	100.00%
Lumen Technologies | Trade Accounts Receivable and Costs and Estimated Earnings | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 166,000	$ 173,500
% of Total	18.40%	16.60%
Verizon Communications Inc. | Trade Accounts Receivable and Costs and Estimated Earnings | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 144,300	$ 389,900
% of Total	16.00%	37.40%
Comcast Corporation | Trade Accounts Receivable and Costs and Estimated Earnings | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 113,500	$ 131,700
% of Total	12.60%	12.60%
AT&T Inc. | Trade Accounts Receivable and Costs and Estimated Earnings | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 106,000	$ 71,700
% of Total	11.70%	6.90%