Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Jun. 29, 2025	Jan. 31, 2025
Goodwill [Line Items]
Goodwill	$ 1,157,933	$ 1,283,036
Accumulated impairment losses	(762,566)	(762,566)
Foreign currency translation adjustment	40,778
Total Goodwill	395,367	520,470
AET
Goodwill [Line Items]
Acquisition	1,257
Total Goodwill			$ 1,300
Quantifi
Goodwill [Line Items]
Acquisition	83,068
Robotics
Goodwill [Line Items]
Goodwill	375,298	415,868
Accumulated impairment losses	0	0
Foreign currency translation adjustment	40,570
Total Goodwill	375,298	415,868
Robotics | AET
Goodwill [Line Items]
Acquisition	0
Robotics | Quantifi
Goodwill [Line Items]
Acquisition	0
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,117	263,582
Accumulated impairment losses	(260,540)	(260,540)
Foreign currency translation adjustment	(208)
Total Goodwill	1,577	3,042
Semiconductor Test | AET
Goodwill [Line Items]
Acquisition	1,257
Semiconductor Test | Quantifi
Goodwill [Line Items]
Acquisition	0
Product Test
Goodwill [Line Items]
Goodwill	520,518	603,586
Accumulated impairment losses	(502,026)	(502,026)
Foreign currency translation adjustment	0
Total Goodwill	18,492	$ 101,560
Product Test | AET
Goodwill [Line Items]
Acquisition	0
Product Test | Quantifi
Goodwill [Line Items]
Acquisition	$ 83,068