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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 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Disaggregation of Revenue [Line Items]        
Total $ 819,484 [1] $ 582,038 [1] $ 2,362,500 [2] $ 1,640,315 [2]
Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 592,141 397,737 1,735,777 1,113,489
System Test        
Disaggregation of Revenue [Line Items]        
Total 118,169 [1] 73,305 [1] 306,051 [2] 204,934 [2]
Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 68,711 68,892 187,792 209,753
Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 40,504 [1] 42,264 [1] 133,174 [2] 112,541 [2]
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total (41) [1] (160) [1] (294) [2] (402) [2]
Point in Time        
Disaggregation of Revenue [Line Items]        
Total 736,325 [1] 510,454 [1] 2,124,031 [2] 1,424,332 [2]
Point in Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 101,045 [1] 61,988 [1] 259,498 [2] 167,500 [2]
Point in Time | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 37,901 [1] 39,948 [1] 125,304 [2] 106,705 [2]
Point in Time | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total (41) [1] (160) [1] (294) [2] (402) [2]
Over Time        
Disaggregation of Revenue [Line Items]        
Total 83,159 [1] 71,584 [1] 238,469 [2] 215,983 [2]
Over Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 17,124 [1] 11,317 [1] 46,553 [2] 37,434 [2]
Over Time | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 2,603 [1] 2,316 [1] 7,870 [2] 5,836 [2]
Over Time | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total [1]   [2]  
Americas        
Disaggregation of Revenue [Line Items]        
Total 87,494 [1] 78,536 [1] 232,840 [2] 232,731 [2]
Americas | System Test        
Disaggregation of Revenue [Line Items]        
Total 35,140 [1] 33,868 [1] 91,924 [2] 90,591 [2]
Americas | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 5,211 [1] 6,344 [1] 15,253 [2] 14,511 [2]
Americas | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total (41) [1] (160) [1] (294) [2] (402) [2]
Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total 45,447 [1] 52,700 [1] 147,678 [2] 163,744 [2]
Europe, Middle East and Africa | System Test        
Disaggregation of Revenue [Line Items]        
Total 4,495 [1] 7,178 [1] 16,919 [2] 19,607 [2]
Europe, Middle East and Africa | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 1,428 [1] 1,268 [1] 4,345 [2] 2,715 [2]
Europe, Middle East and Africa | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total [1]   [2]  
Asia Pacific        
Disaggregation of Revenue [Line Items]        
Total 686,543 [1] 450,802 [1] 1,981,982 [2] 1,243,840 [2]
Asia Pacific | System Test        
Disaggregation of Revenue [Line Items]        
Total 78,534 [1] 32,259 [1] 197,208 [2] 94,736 [2]
Asia Pacific | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 33,865 [1] 34,652 [1] 113,576 [2] 95,315 [2]
Asia Pacific | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total [1]   [2]  
SOC | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 449,705 [1] 324,477 [1] 1,423,627 [2] 930,290 [2]
SOC | Point in Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 393,717 [1] 273,111 [1] 1,261,468 [2] 776,589 [2]
SOC | Over Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 55,988 [1] 51,366 [1] 162,159 [2] 153,701 [2]
SOC | Americas | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 17,678 [1] 14,804 [1] 51,315 [2] 46,594 [2]
SOC | Europe, Middle East and Africa | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 11,206 [1] 12,083 [1] 41,849 [2] 43,132 [2]
SOC | Asia Pacific | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 420,821 [1] 297,590 [1] 1,330,463 [2] 840,564 [2]
Memory | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 142,436 [1] 73,260 [1] 312,150 [2] 183,199 [2]
Memory | Point in Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 137,929 [1] 68,510 [1] 298,150 [2] 169,877 [2]
Memory | Over Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 4,507 [1] 4,750 [1] 14,000 [2] 13,322 [2]
Memory | Americas | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 3,730 [1] 4,085 [1] 11,481 [2] 21,728 [2]
Memory | Europe, Middle East and Africa | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 1,420 [1] 529 [1] 3,990 [2] 3,745 [2]
Memory | Asia Pacific | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 137,286 [1] 68,646 [1] 296,679 [2] 157,726 [2]
Universal Robots (UR) | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 53,209 [1] 59,261 [1] 146,457 [2] 180,510 [2]
Universal Robots (UR) | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 51,523 [1] 57,426 [1] 140,829 [2] 174,820 [2]
Universal Robots (UR) | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 1,686 [1] 1,835 [1] 5,628 [2] 5,690 [2]
Universal Robots (UR) | Americas | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 16,527 [1] 16,775 [1] 42,634 [2] 50,557 [2]
Universal Robots (UR) | Europe, Middle East and Africa | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 22,211 [1] 26,631 [1] 64,158 [2] 80,662 [2]
Universal Robots (UR) | Asia Pacific | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 14,471 [1] 15,855 [1] 39,665 [2] 49,291 [2]
MiR | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 10,234 [1] 9,631 [1] 30,644 [2] 29,243 [2]
MiR | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 10,175 [1] 9,631 [1] 30,468 [2] 29,243 [2]
MiR | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 59 [1]   176 [2]  
MiR | Americas | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 3,981 [1] 2,820 [1] 9,836 [2] 9,152 [2]
MiR | Europe, Middle East and Africa | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 4,687 [1] 5,011 [1] 16,417 [2] 13,883 [2]
MiR | Asia Pacific | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 1,566 [1] $ 1,800 [1] 4,391 [2] $ 6,208 [2]
Autoguide LLC [Member] | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 5,268 [1]   10,691 [2]  
Autoguide LLC [Member] | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 4,076 [1]   8,608 [2]  
Autoguide LLC [Member] | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 1,192 [1]   2,083 [2]  
Autoguide LLC [Member] | Americas | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 5,268 [1]   10,691 [2]  
Autoguide LLC [Member] | Europe, Middle East and Africa | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total [1]   [2]  
Autoguide LLC [Member] | Asia Pacific | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total [1]   [2]  
[1] Includes $1.7 million and $1.5 million in 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”
[2] Includes $6.1 million and $4.9 million in 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside ASC 606 “Revenue from Contracts with Customers.”