Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	9 Months Ended
	Oct. 02, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill	$ 1,138,365	$ 1,188,590
Accumulated impairment losses	(762,566)	(762,566)
Total goodwill	375,799	426,024
Foreign currency translation adjustment	(50,225)
Industrial Automation
Goodwill [Line Items]
Goodwill	355,845	405,971
Total goodwill	355,845	405,971
Foreign currency translation adjustment	(50,126)
Wireless Test
Goodwill [Line Items]
Goodwill	361,819	361,819
Accumulated impairment losses	(353,843)	(353,843)
Total goodwill	7,976	7,976
Foreign currency translation adjustment	0
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,002	262,101
Accumulated impairment losses	(260,540)	(260,540)
Total goodwill	1,462	1,561
Foreign currency translation adjustment	(99)
System Test
Goodwill [Line Items]
Goodwill	158,699	158,699
Accumulated impairment losses	(148,183)	(148,183)
Total goodwill	10,516	$ 10,516
Foreign currency translation adjustment	$ 0