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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 |

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