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Concentration of Credit Risk - Revenue Concentration Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
Concentration Risk
Contract revenues	$ 833,743	$ 731,375
Concentration risk percentage	100.00%	100.00%
Sales Revenue, Services, Net | Customer Concentration Risk
Concentration Risk
Concentration risk percentage	10.00%
Sales Revenue, Services, Net | Customer Concentration Risk | Five Unnamed Customers
Concentration Risk
Concentration risk percentage	80.40%	78.80%
Sales Revenue, Services, Net | Customer Concentration Risk | Verizon Communications Inc.
Concentration Risk
Contract revenues	$ 209,300	$ 177,000
Concentration risk percentage	25.10%	24.20%
Sales Revenue, Services, Net | Customer Concentration Risk | AT&T Inc.
Concentration Risk
Contract revenues	$ 137,100	$ 159,200
Concentration risk percentage	16.40%	21.80%
Sales Revenue, Services, Net | Customer Concentration Risk | Comcast Corporation
Concentration Risk
Contract revenues	$ 179,800	$ 122,100
Concentration risk percentage	21.60%	16.70%
Sales Revenue, Services, Net | Customer Concentration Risk | CenturyLink, Inc.
Concentration Risk
Contract revenues	$ 109,800	$ 89,700
Concentration risk percentage	13.20%	12.30%
Sales Revenue, Services, Net | Customer Concentration Risk | Total other customers combined
Concentration Risk
Contract revenues	$ 197,700	$ 183,400
Concentration risk percentage	23.70%	25.00%

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