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Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Segment Reporting Information [Line Items]
Restructuring and other	$ 400		$ 300
Contingent consideration adjustment			(7,227)	$ 19,239
Other (income) expense, net - loss on convertible debt conversion	87	$ 4,017	(3,738)	(2,833)
Semiconductor Test
Segment Reporting Information [Line Items]
Contract termination settlement charge		4,000		4,000
Cost of revenues - inventory charge		3,799	1,234	6,825
Acquisition related costs		3,100		4,500
Industrial Automation
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge			1,285
Acquisition related costs			550	790
Wireless Test
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge		1,582	672	2,155
Corporate And Eliminations
Segment Reporting Information [Line Items]
Restructuring and other	1,700	750	1,846	750
Corporate And Eliminations | Restructuring and other
Segment Reporting Information [Line Items]
Acquisition related costs		2,974	(513)	3,715
Other (income) expense, net - loss on convertible debt conversion	$ 1,175		5,244
Corporate And Eliminations | Universal Robots (UR) | Restructuring and other
Segment Reporting Information [Line Items]
Contingent consideration adjustment		29,927	$ (7,227)	22,785
Corporate And Eliminations | Mobile Industrial Robots (MiR) | Restructuring and other
Segment Reporting Information [Line Items]
Contingent consideration adjustment		$ (668)		$ (3,546)

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