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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 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Total $ 838,661 [1] $ 564,178 [1] $ 1,543,016 [2] $ 1,058,277 [2]
Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 659,147 374,898 1,143,636 715,751
System Test        
Disaggregation of Revenue [Line Items]        
Total 71,806 [1] 73,407 [1] 187,882 [2] 131,627 [2]
Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 58,776 74,726 119,081 140,862
Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 49,185 [1] 41,236 [1] 92,670 [2] 70,277 [2]
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total (253) [1] (89) [1] (253) [2] (240) [2]
Point in Time        
Disaggregation of Revenue [Line Items]        
Total 760,771 [1] 490,918 [1] 1,387,705 [2] 910,474 [2]
Point in Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 57,741 [1] 60,137 [1] 158,453 [2] 105,373 [2]
Point in Time | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 46,347 [1] 39,236 [1] 87,403 [2] 66,691 [2]
Point in Time | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total (253) [1] (89) [1] (253) [2] (240) [2]
Over Time        
Disaggregation of Revenue [Line Items]        
Total 77,890 [1] 73,260 [1] 155,311 [2] 147,803 [2]
Over Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 14,065 [1] 13,270 [1] 29,429 [2] 26,254 [2]
Over Time | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 2,838 [1] 2,000 [1] 5,267 [2] 3,586 [2]
Over Time | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total [1]   [2]  
Americas        
Disaggregation of Revenue [Line Items]        
Total 68,407 [1] 80,895 [1] 145,346 [2] 154,064 [2]
Americas | System Test        
Disaggregation of Revenue [Line Items]        
Total 28,494 [1] 29,911 [1] 56,784 [2] 56,718 [2]
Americas | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 5,353 [1] 5,926 [1] 10,041 [2] 8,167 [2]
Americas | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total (253) [1] (89) [1] (253) [2] (240) [2]
Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total 43,988 [1] 55,766 [1] 102,231 [2] 110,867 [2]
Europe, Middle East and Africa | System Test        
Disaggregation of Revenue [Line Items]        
Total 4,656 [1] 5,305 [1] 12,424 [2] 12,431 [2]
Europe, Middle East and Africa | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 1,925 [1] 668 [1] 2,918 [2] 1,449 [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 726,266 [1] 427,517 [1] 1,295,439 [2] 793,346 [2]
Asia Pacific | System Test        
Disaggregation of Revenue [Line Items]        
Total 38,656 [1] 38,191 [1] 118,674 [2] 62,478 [2]
Asia Pacific | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 41,907 [1] 34,642 [1] 79,711 [2] 60,661 [2]
Asia Pacific | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total [1]   [2]  
SOC | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 574,573 [1] 316,613 [1] 974,713 [2] 609,486 [2]
SOC | Point in Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 520,496 [1] 265,130 [1] 868,542 [2] 503,952 [2]
SOC | Over Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 54,077 [1] 51,483 [1] 106,171 [2] 105,534 [2]
SOC | Americas | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 16,251 [1] 15,601 [1] 33,637 [2] 31,768 [2]
SOC | Europe, Middle East and Africa | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 10,622 [1] 15,031 [1] 30,643 [2] 31,344 [2]
SOC | Asia Pacific | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 547,700 [1] 285,981 [1] 910,433 [2] 546,374 [2]
Memory | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 84,574 [1] 58,285 [1] 168,923 [2] 106,265 [2]
Memory | Point in Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 80,032 [1] 53,984 [1] 159,429 [2] 97,693 [2]
Memory | Over Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 4,542 [1] 4,301 [1] 9,494 [2] 8,572 [2]
Memory | Americas | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 855 [1] 8,783 [1] 7,751 [2] 17,546 [2]
Memory | Europe, Middle East and Africa | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 1,227 [1] 2,300 [1] 2,571 [2] 2,731 [2]
Memory | Asia Pacific | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 82,492 [1] 47,202 [1] 158,601 [2] 85,988 [2]
Universal Robots (UR) | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 43,551 [1] 64,221 [1] 93,248 [2] 121,249 [2]
Universal Robots (UR) | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 41,804 [1] 62,015 [1] 89,306 [2] 117,392 [2]
Universal Robots (UR) | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 1,747 [1] 2,206 [1] 3,942 [2] 3,857 [2]
Universal Robots (UR) | Americas | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 11,364 [1] 17,980 [1] 26,108 [2] 33,783 [2]
Universal Robots (UR) | Europe, Middle East and Africa | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 17,908 [1] 27,421 [1] 41,945 [2] 54,029 [2]
Universal Robots (UR) | Asia Pacific | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 14,279 [1] 18,820 [1] 25,195 [2] 33,437 [2]
MiR | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 11,272 [1] 10,505 [1] 20,410 [2] 19,613 [2]
MiR | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 11,196 [1] 10,505 [1] 20,293 [2] 19,613 [2]
MiR | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 76 [1]   117 [2]  
MiR | Americas | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 2,390 [1] 2,783 [1] 5,855 [2] 6,322 [2]
MiR | Europe, Middle East and Africa | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 7,650 [1] 5,041 [1] 11,730 [2] 8,883 [2]
MiR | Asia Pacific | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 1,232 [1] $ 2,681 [1] 2,825 [2] $ 4,408 [2]
Autoguide LLC [Member] | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 3,953 [1]   5,423 [2]  
Autoguide LLC [Member] | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 3,408 [1]   4,532 [2]  
Autoguide LLC [Member] | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 545 [1]   891 [2]  
Autoguide LLC [Member] | Americas | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 3,953 [1]   5,423 [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 $2.5 million and $1.7 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 $4.3 million and $3.4 million in 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside ASC 606 “Revenue from Contracts with Customers.”