Severance, Restructuring and Acquisition Integration Activities - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	$ 4,045,000	$ 11,688,000	$ 10,904,000	$ 57,010,000
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	792,000	4,820,000	$ 1,777,000	21,482,000
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	3,253,000	6,341,000	8,364,000	30,287,000
Research and Development
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	0	527,000	763,000	5,241,000
PPC Broadband and Opterna Integration Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	3,100,000		5,600,000
Grass Valley And SAM Integration Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	$ 0	7,100,000	$ 3,000,000.0	36,600,000
Industrial Manufacturing Footprint Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		$ 4,300,000		$ 15,800,000