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Restructuring and Other - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Restructuring Cost and Reserve
Contingent consideration adjustment			$ 1,847	$ 10,451
Lease termination period			2017-09
Property, Plant and Equipment
Restructuring Cost and Reserve
Impairment of fixed assets and other expenses				4,200
Semiconductor Test and Wireless Test
Restructuring Cost and Reserve
Severance benefit and charges	$ 600	$ 4,200		5,900
Industrial Automation
Restructuring Cost and Reserve
Severance benefit and charges			$ 2,000
Earthquake Related Expenses
Restructuring Cost and Reserve
Impairment of fixed assets and other expenses	800		800
Wireless Test
Restructuring Cost and Reserve
Lease termination	400
Lease impairment			900
Impairment of fixed assets and expenses related to the Japan earthquake
Restructuring Cost and Reserve
Property insurance, recovery	5,100		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
Universal Robots
Restructuring Cost and Reserve
Contingent consideration adjustment	$ (300)	$ 8,000	$ 1,800	9,900
Avionics Interface Technologies, LLC
Restructuring Cost and Reserve
Contingent consideration adjustment				$ 600

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The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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