Restructuring and Other - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017 USD ($)	Jul. 03, 2016 USD ($) Employee	Jul. 02, 2017 USD ($)	Jul. 03, 2016 USD ($) Employee
Restructuring Cost and Reserve
Contingent consideration adjustment		$ 1,300	$ 2,133	$ 2,478
Severance benefit and charges	$ 800
Lease expiration year			2020
Property, Plant and Equipment
Restructuring Cost and Reserve
Impairment of fixed assets and other expenses		4,200		4,200
Industrial Automation
Restructuring Cost and Reserve
Severance benefit and charges			$ 1,400
Wireless Test
Restructuring Cost and Reserve
Lease impairment			1,300
Impairment of fixed assets and expenses related to the Japan earthquake
Restructuring Cost and Reserve
Property insurance, recovery		5,100		5,100
Impairment of fixed assets and expenses related to the Japan earthquake | Earthquake Related Expenses
Restructuring Cost and Reserve
Impairment of fixed assets and other expenses		$ 900		$ 900
Semiconductor Test
Restructuring Cost and Reserve
Reduction in employees headcount | Employee		15		27
Semiconductor Test and Wireless Test
Restructuring Cost and Reserve
Severance benefit and charges		$ 1,300		$ 1,700
Reduction in employees headcount | Employee		62		74
Wireless Test
Restructuring Cost and Reserve
Reduction in employees headcount | Employee		47		47
Universal Robots
Restructuring Cost and Reserve
Contingent consideration adjustment	$ 1,500	$ 800	$ 2,100	$ 1,900
Avionics Interface Technologies, LLC
Restructuring Cost and Reserve
Contingent consideration adjustment		$ 600		$ 600