Severance, Restructuring and Acquisition Integration Activities - Severance, Restructuring and Integration Costs by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
Restructuring Cost and Reserve [Line Items]
Total Costs	$ 6,600	$ 8,408
Broadcast Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Total Costs	408	4,378
Enterprise Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Total Costs	4,873	500
Industrial Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Total Costs	1,121	865
Network Security Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Total Costs	198	2,665
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance	901	1,542
Employee Severance [Member] | Broadcast Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Severance	49	(784)
Employee Severance [Member] | Enterprise Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Severance	852	0
Employee Severance [Member] | Industrial Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Severance	0	444
Employee Severance [Member] | Network Security Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Severance	0	1,882
Other Than Severance Costs Restructuring and Integration Costs Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	5,699	6,866
Other Than Severance Costs Restructuring and Integration Costs Member] | Broadcast Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	359	5,162
Other Than Severance Costs Restructuring and Integration Costs Member] | Enterprise Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	4,021	500
Other Than Severance Costs Restructuring and Integration Costs Member] | Industrial Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	1,121	421
Other Than Severance Costs Restructuring and Integration Costs Member] | Network Security Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	$ 198	$ 783