Accounts Receivable, Contract Assets, and Contract Liabilities - Customer Credit Concentration (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	May 01, 2021	Oct. 30, 2021	Jan. 30, 2021
Concentration Risk
Amount		$ 959,741	$ 858,123
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Verizon Communications Inc.
Concentration Risk
Amount		$ 233,500	389,900
% of Total	37.40%	22.10%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Lumen Technologies
Concentration Risk
Amount		$ 177,400	173,500
% of Total	16.60%	16.80%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Comcast Corporation
Concentration Risk
Amount		$ 131,500	131,700
% of Total	12.60%	12.40%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | AT&T Inc.
Concentration Risk
Amount		$ 107,000	$ 71,700
% of Total	6.90%	10.10%