Severance, Restructuring and Acquisition Integration Activities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended	9 Months Ended
	Dec. 31, 2016	Oct. 02, 2016	Apr. 03, 2016	Dec. 31, 2015	Sep. 27, 2015	Dec. 31, 2017	Oct. 02, 2016	Sep. 27, 2015
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		$ 12,795			$ 14,143		$ 27,072	$ 33,533
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		2,900			3,200		6,800	6,300
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		9,900			9,300		19,600	23,800
Research and Development [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		0			1,600		700	3,400
Industrial Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		2,600					8,400
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		10,000					12,500
Industrial Manufacturing Footprint Program [Member] | Scenario, Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Additional severance and other restructuring costs	$ 5,000					$ 15,000
Expected savings from the restructuring program						$ 10,000
Grass Valley Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		100					5,100
Savings from the restructuring program				$ 30,000
Grass Valley Restructuring Program [Member] | Scenario, Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Estimated severance charges and other restructuring costs	$ 1,000
Productivity Improvement Program and Acquisition Integration [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs					$ 100			$ 19,500
Productivity Improvement Program and Acquisition Integration [Member] | M2FX Limited [Member]
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		$ 100					$ 1,100
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and integration cost payable period							60 days