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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. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Disaggregation of Revenue [Line Items]        
Total $ 564,178 $ 526,929 $ 1,058,277 $ 1,014,396
Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 374,898 360,088 715,751 733,416
System Test        
Disaggregation of Revenue [Line Items]        
Total 73,407 69,682 131,627 112,702
Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 74,726 62,057 140,862 110,891
Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 41,236 35,212 70,277 57,719
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total (89) (110) (240) (332)
Americas | Point in Time        
Disaggregation of Revenue [Line Items]        
Total 62,636 53,486 119,067 98,480
Americas | Point in Time | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 5,250 4,716 7,340 9,695
Americas | Point in Time | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total (89) (110) (240) (332)
Americas | Over Time        
Disaggregation of Revenue [Line Items]        
Total 18,259 17,125 34,997 33,785
Americas | Over Time | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 676 122 827 233
Europe, Middle East and Africa | Point in Time        
Disaggregation of Revenue [Line Items]        
Total 47,226 45,012 93,994 86,423
Europe, Middle East and Africa | Point in Time | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 620 26 1,356 1,066
Europe, Middle East and Africa | Over Time        
Disaggregation of Revenue [Line Items]        
Total 8,540 8,978 16,873 16,925
Europe, Middle East and Africa | Over Time | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 48 257 93 484
Asia Pacific        
Disaggregation of Revenue [Line Items]        
Total 1,658 3,625 3,399 7,894
Asia Pacific | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 34 325 65 513
Asia Pacific | Point in Time        
Disaggregation of Revenue [Line Items]        
Total 381,056 356,803 697,413 688,600
Asia Pacific | Point in Time | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 33,366 27,663 57,995 41,329
Asia Pacific | Over Time        
Disaggregation of Revenue [Line Items]        
Total 44,803 41,900 92,534 82,289
Asia Pacific | Over Time | Wireless Test        
Disaggregation of Revenue [Line Items]        
Total 1,242 2,103 2,601 4,399
SOC | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 316,613 293,532 609,486 594,299
SOC | Americas | Point in Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 7,426 12,111 15,403 21,711
SOC | Americas | Over Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 8,175 8,934 16,365 17,517
SOC | Europe, Middle East and Africa | Point in Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 9,819 10,227 20,851 22,352
SOC | Europe, Middle East and Africa | Over Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 5,212 5,689 10,493 10,888
SOC | Asia Pacific | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 1,530 3,268 3,197 7,115
SOC | Asia Pacific | Point in Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 247,885 218,352 467,698 446,543
SOC | Asia Pacific | Over Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 36,566 34,951 75,479 68,173
Memory | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 58,285 66,556 106,265 139,117
Memory | Americas | Point in Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 8,059 2,827 16,110 5,691
Memory | Americas | Over Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 724 710 1,436 1,406
Memory | Europe, Middle East and Africa | Point in Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 2,016 847 2,168 986
Memory | Europe, Middle East and Africa | Over Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 284 254 563 523
Memory | Asia Pacific | Point in Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 43,909 59,633 79,415 125,904
Memory | Asia Pacific | Over Time | Semiconductor Test        
Disaggregation of Revenue [Line Items]        
Total 3,293 2,285 6,573 4,607
Defense/Aerospace | System Test        
Disaggregation of Revenue [Line Items]        
Total 25,283 23,122 48,050 43,264
Defense/Aerospace | Americas | Point in Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 17,225 15,256 32,007 26,853
Defense/Aerospace | Americas | Over Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 6,850 6,237 13,300 12,425
Defense/Aerospace | Europe, Middle East and Africa | Point in Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 211 447 250 1,943
Defense/Aerospace | Europe, Middle East and Africa | Over Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 505 539 974 1,090
Defense/Aerospace | Asia Pacific | Point in Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 163 385 426 487
Defense/Aerospace | Asia Pacific | Over Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 329 258 1,093 466
Storage Test | System Test        
Disaggregation of Revenue [Line Items]        
Total 33,685 33,257 53,938 45,191
Storage Test | Americas | Point in Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 3,703 5 5,295 284
Storage Test | Asia Pacific | Point in Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 27,672 31,824 44,279 41,946
Storage Test | Asia Pacific | Over Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 2,310 1,428 4,364 2,961
Production Board Test | System Test        
Disaggregation of Revenue [Line Items]        
Total 14,439 13,303 29,639 24,247
Production Board Test | Americas | Point in Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 1,341 1,429 4,595 3,189
Production Board Test | Americas | Over Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 792 795 1,521 1,552
Production Board Test | Europe, Middle East and Africa | Point in Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 2,974 4,849 8,038 8,886
Production Board Test | Europe, Middle East and Africa | Over Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 1,615 1,713 3,169 3,272
Production Board Test | Asia Pacific | System Test        
Disaggregation of Revenue [Line Items]        
Total 94 32 137 266
Production Board Test | Asia Pacific | Point in Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 6,848 3,741 10,483 5,603
Production Board Test | Asia Pacific | Over Time | System Test        
Disaggregation of Revenue [Line Items]        
Total 775 744 1,696 1,479
Universal Robots (UR) | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 62,948 57,548 121,249 106,382
Universal Robots (UR) | Americas | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 16,938 16,053 32,235 30,190
Universal Robots (UR) | Americas | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 255 327 501 652
Universal Robots (UR) | Europe, Middle East and Africa | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 26,545 26,616 52,448 49,190
Universal Robots (UR) | Europe, Middle East and Africa | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 399 526 815 668
Universal Robots (UR) | Asia Pacific | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 18,532 13,895 32,709 25,478
Universal Robots (UR) | Asia Pacific | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 279 131 507 204
Mobile Industrial Robots (MiR) | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 10,505 4,509 19,613 4,509
Mobile Industrial Robots (MiR) | Americas | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 2,783 1,199 6,322 1,199
Mobile Industrial Robots (MiR) | Europe, Middle East and Africa | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 5,041 2,000 8,883 2,000
Mobile Industrial Robots (MiR) | Asia Pacific | Point in Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 2,681 $ 1,310 4,408 $ 1,310
Energid Technologies Corporation | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 1,273   2,034  
Energid Technologies Corporation | Americas | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 787   1,047  
Energid Technologies Corporation | Europe, Middle East and Africa | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total 477   766  
Energid Technologies Corporation | Asia Pacific | Over Time | Industrial Automation        
Disaggregation of Revenue [Line Items]        
Total $ 9   $ 221