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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
--- | ---
Mar. 31, 2019 | Apr. 01, 2018
Disaggregation of Revenue [Line Items] |  |
Total | $ 494,099 | $ 487,467
Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 340,853 | 373,328
System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 58,220 | 43,019
Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 66,136 | 48,834
Wireless Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 29,041 | 22,507
Corporate and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total | (151) | (221)
Americas | Point in Time |  |
Disaggregation of Revenue [Line Items] |  |
Total | 56,433 | 45,229
Americas | Point in Time | Wireless Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 2,090 | 4,979
Americas | Point in Time | Corporate and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total | (151) | (221)
Americas | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Total | 16,738 | 16,633
Americas | Over Time | Wireless Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 151 | 112
Europe, Middle East and Africa | Point in Time |  |
Disaggregation of Revenue [Line Items] |  |
Total | 46,768 | 41,412
Europe, Middle East and Africa | Point in Time | Wireless Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 736 | 1,041
Europe, Middle East and Africa | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Total | 8,334 | 7,963
Europe, Middle East and Africa | Over Time | Wireless Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 45 | 227
Asia Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,742 | 4,269
Asia Pacific | Wireless Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 32 | 188
Asia Pacific | Point in Time |  |
Disaggregation of Revenue [Line Items] |  |
Total | 316,354 | 328,455
Asia Pacific | Point in Time | Wireless Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 24,628 | 13,664
Asia Pacific | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Total | 47,730 | 43,506
Asia Pacific | Over Time | Wireless Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,359 | 2,296
SOC | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 292,806 | 300,766
SOC | Americas | Point in Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 7,977 | 9,600
SOC | Americas | Over Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 8,190 | 8,791
SOC | Europe, Middle East and Africa | Point in Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 11,032 | 12,125
SOC | Europe, Middle East and Africa | Over Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 5,281 | 5,214
SOC | Asia Pacific | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,667 | 3,847
SOC | Asia Pacific | Point in Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 219,746 | 224,851
SOC | Asia Pacific | Over Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 38,913 | 36,338
Memory | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 48,047 | 72,562
Memory | Americas | Point in Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 8,051 | 2,862
Memory | Americas | Over Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 712 | 696
Memory | Europe, Middle East and Africa | Point in Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 153 | 139
Memory | Europe, Middle East and Africa | Over Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 280 | 269
Memory | Asia Pacific | Point in Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 35,571 | 66,273
Memory | Asia Pacific | Over Time | Semiconductor Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 3,280 | 2,323
Defense/Aerospace | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 22,768 | 20,142
Defense/Aerospace | Americas | Point in Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 14,783 | 11,597
Defense/Aerospace | Americas | Over Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 6,450 | 6,188
Defense/Aerospace | Europe, Middle East and Africa | Point in Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 39 | 1,497
Defense/Aerospace | Europe, Middle East and Africa | Over Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 469 | 551
Defense/Aerospace | Asia Pacific | Point in Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 263 | 101
Defense/Aerospace | Asia Pacific | Over Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 764 | 208
Storage Test | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 20,252 | 11,934
Storage Test | Americas | Point in Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,593 | 279
Storage Test | Asia Pacific | Point in Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 16,605 | 10,122
Storage Test | Asia Pacific | Over Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 2,054 | 1,533
Production Board Test | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 15,200 | 10,943
Production Board Test | Americas | Point in Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 3,254 | 1,760
Production Board Test | Americas | Over Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 729 | 757
Production Board Test | Europe, Middle East and Africa | Point in Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 5,064 | 4,037
Production Board Test | Europe, Middle East and Africa | Over Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,554 | 1,559
Production Board Test | Asia Pacific | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 43 | 234
Production Board Test | Asia Pacific | Point in Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 3,636 | 1,861
Production Board Test | Asia Pacific | Over Time | System Test |  |
Disaggregation of Revenue [Line Items] |  |
Total | 920 | 735
Universal Robots (UR) | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 56,269 | 48,834
Universal Robots (UR) | Americas | Point in Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 15,297 | 14,373
Universal Robots (UR) | Americas | Over Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 246 | 89
Universal Robots (UR) | Europe, Middle East and Africa | Point in Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 25,904 | 22,573
Universal Robots (UR) | Europe, Middle East and Africa | Over Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 416 | 143
Universal Robots (UR) | Asia Pacific | Point in Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 14,178 | 11,583
Universal Robots (UR) | Asia Pacific | Over Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 228 | $ 73
Mobile Industrial Robots (MiR) | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 9,106 |
Mobile Industrial Robots (MiR) | Americas | Point in Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 3,539 |
Mobile Industrial Robots (MiR) | Europe, Middle East and Africa | Point in Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 3,840 |
Mobile Industrial Robots (MiR) | Europe, Middle East and Africa | Over Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 0 |
Mobile Industrial Robots (MiR) | Asia Pacific | Point in Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,727 |
Energid Technologies Corporation | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 761 |
Energid Technologies Corporation | Americas | Over Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 260 |
Energid Technologies Corporation | Europe, Middle East and Africa | Over Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | 289 |
Energid Technologies Corporation | Asia Pacific | Over Time | Industrial Automation |  |
Disaggregation of Revenue [Line Items] |  |
Total | $ 212 |

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