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Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total $ 685,680 $ 599,819
Product Test    
Disaggregation of Revenue [Line Items]    
Total 74,189 77,395
Total Reportable Segments    
Disaggregation of Revenue [Line Items]    
Total 685,680 599,819
Point in Time    
Disaggregation of Revenue [Line Items]    
Total 585,950 496,198
Point in Time | Product Test    
Disaggregation of Revenue [Line Items]    
Total 56,559 62,353
Point in Time | Total Reportable Segments    
Disaggregation of Revenue [Line Items]    
Total 585,950 496,198
Over Time    
Disaggregation of Revenue [Line Items]    
Total 99,730 103,621
Over Time | Product Test    
Disaggregation of Revenue [Line Items]    
Total 17,630 15,042
Over Time | Total Reportable Segments    
Disaggregation of Revenue [Line Items]    
Total 99,730 103,621
Asia Pacific    
Disaggregation of Revenue [Line Items]    
Total 532,408 423,674
Asia Pacific | Product Test    
Disaggregation of Revenue [Line Items]    
Total 25,546 23,056
Asia Pacific | Total Reportable Segments    
Disaggregation of Revenue [Line Items]    
Total 532,408 423,674
Americas    
Disaggregation of Revenue [Line Items]    
Total 109,915 108,651
Americas | Product Test    
Disaggregation of Revenue [Line Items]    
Total 40,785 39,768
Americas | Total Reportable Segments    
Disaggregation of Revenue [Line Items]    
Total 109,915 108,651
Europe, Middle East and Africa    
Disaggregation of Revenue [Line Items]    
Total 43,357 67,494
Europe, Middle East and Africa | Product Test    
Disaggregation of Revenue [Line Items]    
Total 7,858 14,571
Europe, Middle East and Africa | Total Reportable Segments    
Disaggregation of Revenue [Line Items]    
Total 43,357 67,494
System-on-a-chip | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 406,391 302,308
System-on-a-chip | Point in Time | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 337,691 229,592
System-on-a-chip | Over Time | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 68,700 72,716
System-on-a-chip | Asia Pacific | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 358,103 270,567
System-on-a-chip | Americas | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 35,052 22,551
System-on-a-chip | Europe, Middle East and Africa | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 13,236 9,190
Memory | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 109,407 109,946
Memory | Point in Time | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 101,662 102,436
Memory | Over Time | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 7,745 7,510
Memory | Asia Pacific | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 107,681 95,606
Memory | Americas | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 917 9,052
Memory | Europe, Middle East and Africa | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 809 5,288
IST | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 26,706 22,516
IST | System Test    
Disaggregation of Revenue [Line Items]    
Total 26,706  
IST | Point in Time | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 22,892 16,634
IST | Over Time | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 3,814 5,882
IST | Asia Pacific | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 26,016 19,866
IST | Americas | Semiconductor Test    
Disaggregation of Revenue [Line Items]    
Total 690 2,650
Universal Robots (UR) | Robotics    
Disaggregation of Revenue [Line Items]    
Total 68,987 87,654
Universal Robots (UR) | Point in Time | Robotics    
Disaggregation of Revenue [Line Items]    
Total 67,146 85,183
Universal Robots (UR) | Over Time | Robotics    
Disaggregation of Revenue [Line Items]    
Total 1,841 2,471
Universal Robots (UR) | Asia Pacific | Robotics    
Disaggregation of Revenue [Line Items]    
Total 15,062 14,579
Universal Robots (UR) | Americas | Robotics    
Disaggregation of Revenue [Line Items]    
Total 32,471 34,630
Universal Robots (UR) | Europe, Middle East and Africa | Robotics    
Disaggregation of Revenue [Line Items]    
Total $ 21,454 $ 38,445