Accounts Receivable, Contract Assets, and Contract Liabilities - Customer Credit Concentration (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Apr. 30, 2022	Oct. 29, 2022	Jan. 29, 2022
Concentration Risk
Amount		$ 1,244,482	$ 895,898
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Lumen Technologies
Concentration Risk
Amount		$ 226,900	166,000
% of Total	18.40%	17.60%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | AT&T Inc.
Concentration Risk
Amount		$ 176,100	106,000
% of Total	11.70%	13.70%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Verizon Communications Inc.
Concentration Risk
Amount		$ 153,800	144,300
% of Total	16.00%	12.00%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Comcast Corporation
Concentration Risk
Amount		$ 145,900	$ 113,500
% of Total	12.60%	11.30%