Severance, Restructuring and Acquisition Integration Activities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	$ 3,000		$ 3,000
Severance, restructuring, and acquisition integration costs	3,082	$ 24,928	$ 6,860	$ 45,322
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and integration cost payable period			60 days
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	423	7,231	$ 985	16,662
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	2,333	14,544	5,112	23,946
Research and Development
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	326	3,153	763	4,714
PPC Broadband and Opterna Integration Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	$ 2,500		2,500
Grass Valley And SAM Integration Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		20,300	$ 3,000	29,500
Industrial Manufacturing Footprint Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		$ 3,900		$ 11,400