Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Oct. 01, 2023
Goodwill [Line Items]
Goodwill	$ 1,165,761	$ 1,163,706
Accumulated impairment losses	(762,566)	(762,566)
Foreign currency translation adjustment	(2,055)
Total Goodwill	403,195	401,140
Robotics
Goodwill [Line Items]
Goodwill	383,166	381,087
Accumulated impairment losses	0	0
Foreign currency translation adjustment	(2,079)
Total Goodwill	383,166	381,087
Wireless Test
Goodwill [Line Items]
Goodwill	361,819	361,819
Accumulated impairment losses	(353,843)	(353,843)
Foreign currency translation adjustment	0
Total Goodwill	7,976	7,976
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,077	262,101
Accumulated impairment losses	(260,540)	(260,540)
Foreign currency translation adjustment	24
Total Goodwill	1,537	1,561
System Test
Goodwill [Line Items]
Goodwill	158,699	158,699
Accumulated impairment losses	(148,183)	(148,183)
Foreign currency translation adjustment	0
Total Goodwill	$ 10,516	$ 10,516