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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
--- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 526,929 | $ 696,901 | $ 1,014,396 | $ 1,153,814
Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 360,088 | 593,152 | 733,416 | 948,679
System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 69,682 | 36,732 | 112,702 | 76,578
Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 62,057 | 39,337 | 110,891 | 75,610
Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 35,212 | $ 27,680 | 57,719 | $ 52,947
Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | (110) |  | (332) |
Americas | Point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 53,486 |  | 98,480 |
Americas | Point in time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 4,716 |  | 9,695 |
Americas | Point in time | Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | (110) |  | (332) |
Americas | Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 17,125 |  | 33,785 |
Americas | Over time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 122 |  | 233 |
Europe, Middle East and Africa | Point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 45,012 |  | 86,423 |
Europe, Middle East and Africa | Point in time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 26 |  | 1,066 |
Europe, Middle East and Africa | Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 8,978 |  | 16,925 |
Europe, Middle East and Africa | Over time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 257 |  | 484 |
Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 3,625 |  | 7,894 |
Asia Pacific | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 325 |  | 513 |
Asia Pacific | Point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 356,803 |  | 688,600 |
Asia Pacific | Point in time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 27,663 |  | 41,329 |
Asia Pacific | Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 41,900 |  | 82,289 |
Asia Pacific | Over time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,103 |  | 4,399 |
SOC | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 293,532 |  | 594,299 |
SOC | Americas | Point in time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 12,111 |  | 21,711 |
SOC | Americas | Over time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 8,934 |  | 17,517 |
SOC | Europe, Middle East and Africa | Point in time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 10,227 |  | 22,352 |
SOC | Europe, Middle East and Africa | Over time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 5,689 |  | 10,888 |
SOC | Asia Pacific | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 3,268 |  | 7,115 |
SOC | Asia Pacific | Point in time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 218,352 |  | 446,543 |
SOC | Asia Pacific | Over time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 34,951 |  | 68,173 |
Memory | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 66,556 |  | 139,117 |
Memory | Americas | Point in time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,827 |  | 5,691 |
Memory | Americas | Over time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 710 |  | 1,406 |
Memory | Europe, Middle East and Africa | Point in time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 847 |  | 986 |
Memory | Europe, Middle East and Africa | Over time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 254 |  | 523 |
Memory | Asia Pacific | Point in time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 59,633 |  | 125,904 |
Memory | Asia Pacific | Over time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,285 |  | 4,607 |
Defense/Aerospace | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 23,122 |  | 43,264 |
Defense/Aerospace | Americas | Point in time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 15,256 |  | 26,853 |
Defense/Aerospace | Americas | Over time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 6,237 |  | 12,425 |
Defense/Aerospace | Europe, Middle East and Africa | Point in time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 447 |  | 1,943 |
Defense/Aerospace | Europe, Middle East and Africa | Over time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 539 |  | 1,090 |
Defense/Aerospace | Asia Pacific | Point in time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 385 |  | 487 |
Defense/Aerospace | Asia Pacific | Over time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 258 |  | 466 |
Storage Test | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 33,257 |  | 45,191 |
Storage Test | Americas | Point in time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 5 |  | 284 |
Storage Test | Asia Pacific | Point in time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 31,824 |  | 41,946 |
Storage Test | Asia Pacific | Over time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,428 |  | 2,961 |
Production Board Test | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 13,303 |  | 24,247 |
Production Board Test | Americas | Point in time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,429 |  | 3,189 |
Production Board Test | Americas | Over time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 795 |  | 1,552 |
Production Board Test | Europe, Middle East and Africa | Point in time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 4,849 |  | 8,886 |
Production Board Test | Europe, Middle East and Africa | Over time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,713 |  | 3,272 |
Production Board Test | Asia Pacific | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 32 |  | 266 |
Production Board Test | Asia Pacific | Point in time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 3,741 |  | 5,603 |
Production Board Test | Asia Pacific | Over time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 744 |  | 1,479 |
Universal Robots (UR) | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 57,548 |  | 106,382 |
Universal Robots (UR) | Americas | Point in time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 16,053 |  | 30,190 |
Universal Robots (UR) | Americas | Over time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 327 |  | 652 |
Universal Robots (UR) | Europe, Middle East and Africa | Point in time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 26,616 |  | 49,190 |
Universal Robots (UR) | Europe, Middle East and Africa | Over time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 526 |  | 668 |
Universal Robots (UR) | Asia Pacific | Point in time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 13,895 |  | 25,478 |
Universal Robots (UR) | Asia Pacific | Over time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 131 |  | 204 |
Mobile Industrial Robots (MiR) | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 4,509 |  | 4,509 |
Mobile Industrial Robots (MiR) | Americas | Point in time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,199 |  | 1,199 |
Mobile Industrial Robots (MiR) | Europe, Middle East and Africa | Point in time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,000 |  | 2,000 |
Mobile Industrial Robots (MiR) | Asia Pacific | Point in time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 1,310 |  | $ 1,310 |

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