Severance, Restructuring and Acquisition Integration Activities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	15 Months Ended	18 Months Ended	21 Months Ended
	Apr. 02, 2017	Apr. 03, 2016	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2017	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	$ 6,600	$ 8,408
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	5,900	2,100
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	700	6,000
Research and Development [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	0	300
Industrial Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		3,500			$ 13,000
Expected savings from the restructuring program	18,000
Industrial Manufacturing Footprint Program [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	5,700			$ 23,500
Grass Valley Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs	0	$ 4,100				$ 34,100
Savings from the restructuring program	$ 30,000
Scenario, Forecast [Member] | Industrial Manufacturing Footprint Program [Member]
Restructuring Cost and Reserve [Line Items]
Expected savings from the restructuring program			$ 10,000
Additional severance and other restructuring costs			$ 9,000
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and integration cost payable period	60 days