Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total	$ 651,797	$ 729,879	$ 1,337,477	$ 1,329,698
Product Test
Disaggregation of Revenue [Line Items]
Total	85,053	79,716	159,242	157,113
Point in Time
Disaggregation of Revenue [Line Items]
Total	545,291	629,207	1,131,240	1,125,405
Point in Time | Product Test
Disaggregation of Revenue [Line Items]
Total	66,159	63,329	122,717	125,684
Over Time
Disaggregation of Revenue [Line Items]
Total	106,506	100,672	206,237	204,293
Over Time | Product Test
Disaggregation of Revenue [Line Items]
Total	18,894	16,387	36,525	31,429
Asia Pacific
Disaggregation of Revenue [Line Items]
Total	506,658	576,883	1,039,066	1,000,557
Asia Pacific | Product Test
Disaggregation of Revenue [Line Items]
Total	34,901	33,248	60,447	56,306
Americas
Disaggregation of Revenue [Line Items]
Total	89,265	92,060	199,180	200,711
Americas | Product Test
Disaggregation of Revenue [Line Items]
Total	42,229	33,537	83,014	73,305
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	55,874	60,936	99,231	128,430
Europe, Middle East and Africa | Product Test
Disaggregation of Revenue [Line Items]
Total	7,923	12,931	15,781	27,502
System on-a-Chip | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	396,588	413,584	802,978	715,891
System on-a-Chip | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	325,588	343,536	663,278	573,127
System on-a-Chip | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	71,000	70,048	139,700	142,764
System on-a-Chip | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	364,883	381,631	722,985	652,197
System on-a-Chip | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	15,920	20,211	50,972	42,762
System on-a-Chip | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	15,785	11,742	29,021	20,932
Memory | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	60,943	128,980	170,351	238,926
Memory | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	51,993	121,662	153,656	224,098
Memory | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	8,950	7,318	16,695	14,828
Memory | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	58,467	124,497	166,149	220,103
Memory | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	2,077	3,254	2,994	12,306
Memory | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	399	1,229	1,208	6,517
IST | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	34,347	17,352	61,053	39,867
IST | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	28,827	12,463	51,719	29,096
IST | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	5,520	4,889	9,334	10,771
IST | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	32,468	17,304	58,484	37,169
IST | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	1,879	48	2,569	2,698
IST | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Universal Robots (UR) | Robotics
Disaggregation of Revenue [Line Items]
Total	74,866	90,247	143,853	177,901
Universal Robots (UR) | Point in Time | Robotics
Disaggregation of Revenue [Line Items]
Total	72,724	88,217	139,870	173,400
Universal Robots (UR) | Over Time | Robotics
Disaggregation of Revenue [Line Items]
Total	2,142	2,030	3,983	4,501
Universal Robots (UR) | Asia Pacific | Robotics
Disaggregation of Revenue [Line Items]
Total	15,939	20,203	31,001	34,782
Universal Robots (UR) | Americas | Robotics
Disaggregation of Revenue [Line Items]
Total	27,160	35,010	59,631	69,640
Universal Robots (UR) | Europe, Middle East and Africa | Robotics
Disaggregation of Revenue [Line Items]
Total	$ 31,767	$ 35,034	$ 53,221	$ 73,479