Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Apr. 03, 2022
Goodwill [Line Items]
Goodwill	$ 1,188,590	$ 1,182,454
Accumulated impairment losses	(762,566)	(762,566)
Total goodwill	426,024	419,888
Foreign currency translation adjustment	(6,136)
Industrial Automation
Goodwill [Line Items]
Goodwill	405,971	399,849
Total goodwill	405,971	399,849
Foreign currency translation adjustment	(6,122)
Wireless Test
Goodwill [Line Items]
Goodwill	361,819	361,819
Accumulated impairment losses		(353,843)
Total goodwill	7,976	7,976
Foreign currency translation adjustment	0
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,101	262,087
Accumulated impairment losses		(260,540)
Total goodwill	1,561	1,547
Foreign currency translation adjustment	(14)
System Test
Goodwill [Line Items]
Goodwill	158,699	158,699
Accumulated impairment losses		(148,183)
Total goodwill		$ 10,516
Foreign currency translation adjustment	$ 0