Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Mar. 30, 2025
Goodwill [Line Items]
Goodwill	$ 1,157,933	$ 1,171,879
Accumulated impairment losses	(762,566)	(762,566)
AET acquisition	1,257
Foreign currency translation adjustment	12,689
Total Goodwill	395,367	409,313
Robotics
Goodwill [Line Items]
Goodwill	375,298	387,946
Accumulated impairment losses	0	0
AET acquisition	0
Foreign currency translation adjustment	12,648
Total Goodwill	375,298	387,946
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,117	263,415
Accumulated impairment losses	(260,540)	(260,540)
AET acquisition	1,257
Foreign currency translation adjustment	41
Total Goodwill	1,577	2,875
Product Test
Goodwill [Line Items]
Goodwill	520,518	520,518
Accumulated impairment losses	(502,026)	(502,026)
AET acquisition	0
Foreign currency translation adjustment	0
Total Goodwill	$ 18,492	$ 18,492