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Restructuring and Other - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve
Contingent consideration adjustment									$ 987	$ 7,820	$ 15,896
Severance benefit and charges	$ 800	$ 1,700	$ 2,400	$ 3,900	$ 1,800	$ 600	$ 800	$ 600
Acquisition related costs	500	800	2,500	800					4,500
Lease termination period										2017-09
Property, Plant and Equipment
Restructuring Cost and Reserve
Impairment of fixed assets and other expenses											4,200
Wireless Test
Restructuring Cost and Reserve
Lease impairment										$ 1,000
Semiconductor Test | Property, Plant and Equipment
Restructuring Cost and Reserve
Impairment of fixed assets and other expenses										1,100
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						800				800	900
Universal Robots (UR)
Restructuring Cost and Reserve
Contingent consideration adjustment	7,400	$ 800	$ 3,500	$ 5,000	$ 6,000	$ (300)	$ 1,500	$ 600	(16,700)	7,800	15,300
Avionics Interface Technologies, LLC
Restructuring Cost and Reserve
Contingent consideration adjustment											600
Mobile Industrial Robots (MiR)
Restructuring Cost and Reserve
Contingent consideration adjustment	$ 17,700								17,700
Semiconductor Test and Wireless Test
Restructuring Cost and Reserve
Severance benefit and charges											$ 6,000
System Test and Semiconductor Test
Restructuring Cost and Reserve
Severance benefit and charges									$ 8,700
Semiconductor Test, Industrial Automation and Corporate
Restructuring Cost and Reserve
Severance benefit and charges										$ 3,800

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