Restructuring and Other - Additional Information (Detail) $ in Thousands		3 Months Ended			9 Months Ended
	Apr. 16, 2016 USD ($) Utility	Oct. 02, 2016 USD ($) Employee	Jul. 03, 2016 USD ($)	Oct. 04, 2015 USD ($) Employee	Oct. 02, 2016 USD ($) Employee	Oct. 04, 2015 USD ($) Employee
Restructuring Cost and Reserve
Property insurance, recovery			$ 5,400
Contingent consideration adjustment		$ 8,000			$ 10,451	$ (2,600)
Impairment of fixed assets and expenses related to the Japan earthquake
Restructuring Cost and Reserve
Number of remaining utilities | Utility	0
Building impairment and other expenses					5,400
Impairment of fixed assets and expenses related to the Japan earthquake | Earthquake Related Expenses [Member]
Restructuring Cost and Reserve
Building impairment and other expenses		300			1,200
Impairment of fixed assets and expenses related to the Japan earthquake | Buildings
Restructuring Cost and Reserve
Building impairment and other expenses					4,200
Earthquake
Restructuring Cost and Reserve
Earthquake insurance	$ 10,000
Insurance deductible	$ 2,500
System Test
Restructuring Cost and Reserve
Severance benefit and charges				$ 1,100		$ 1,400
Reduction in employees headcount | Employee				18		22
Semiconductor Test and Wireless Test
Restructuring Cost and Reserve
Severance benefit and charges		$ 4,200			$ 5,900
Reduction in employees headcount | Employee		72			146
Wireless Test
Restructuring Cost and Reserve
Reduction in employees headcount | Employee		55			102
Semiconductor Test
Restructuring Cost and Reserve
Reduction in employees headcount | Employee		17			44
ZTEC Instruments, Inc.
Restructuring Cost and Reserve
Contingent consideration adjustment						$ (1,600)
Universal Robots
Restructuring Cost and Reserve
Contingent consideration adjustment		$ 8,000			$ 9,900
Acquisition related costs				$ 100		1,100
Avionics Interface Technologies, LLC
Restructuring Cost and Reserve
Contingent consideration adjustment				$ (1,000)	$ 600	$ (1,000)