Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2022	Oct. 03, 2021	Oct. 02, 2022	Oct. 03, 2021
Segment Reporting Information [Line Items]
Restructuring and other—employee severance	$ 1,796	$ 1,197	$ 19,554	$ (3,426)
Other (income) expense, net - loss on convertible debt conversion	(5,849)	(21,486)	(20,472)	(25,223)
Restructuring and other—AutoGuide contingent consideration adjustment			0	(7,227)
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge	10,829	3,725	13,144	4,959
Industrial Automation
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge	0	3,656	1,411	4,941
Restructuring and other—employee severance	1,074	0	1,616	965
Restructuring and other—acquisition related expenses and compensation				825
Wireless Test
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge	966	679	3,942	1,351
System Test
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge				524
Corporate And Eliminations
Segment Reporting Information [Line Items]
Restructuring and other	700	0	2,700	1,846
Corporate And Eliminations | Restructuring and other
Segment Reporting Information [Line Items]
Restructuring and other—legal settlement charge	0	0	14,700	0
Other (income) expense, net - loss on convertible debt conversion	0	20,153	0	25,397
Restructuring and other—AutoGuide contingent consideration adjustment	0	0	0	(7,227)
Restructuring and other—acquisition related expenses and compensation	$ 0	$ 0	$ 0	$ (513)