Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Mar. 29, 2026	Jan. 31, 2025
Goodwill [Line Items]
Goodwill	$ 1,283,585	$ 1,276,741
Accumulated impairment losses	(762,566)	(762,566)
Foreign currency translation adjustment	(6,844)
Total Goodwill	521,019	514,175
AET
Goodwill [Line Items]
Total Goodwill			$ 1,300
Robotics
Goodwill [Line Items]
Goodwill	416,401	409,567
Accumulated impairment losses	0	0
Foreign currency translation adjustment	(6,834)
Total Goodwill	416,401	409,567
Semiconductor Test
Goodwill [Line Items]
Goodwill	263,598	263,588
Accumulated impairment losses	(260,540)	(260,540)
Foreign currency translation adjustment	(10)
Total Goodwill	3,058	3,048
Product Test
Goodwill [Line Items]
Goodwill	603,586	603,586
Accumulated impairment losses	(502,026)	(502,026)
Foreign currency translation adjustment	0
Total Goodwill	$ 101,560	$ 101,560