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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
--- | ---
Apr. 01, 2018 | Apr. 02, 2017
Disaggregation of Revenue [Line Items] |  |  |
Total |  | $ 487,467 | $ 456,913
Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 373,328 | 355,528
System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 43,019 | 39,845
Industrial Automation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 48,834 | 36,272
Wireless Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 22,507 | $ 25,268
Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | (221) |
Americas | Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 45,229 |
Americas | Point in Time | Industrial Automation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 14,373 |
Americas | Point in Time | Wireless Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 4,979 |
Americas | Point in Time | Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | (221) |
Americas | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 16,633 |
Americas | Over Time | Industrial Automation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 89 |
Americas | Over Time | Wireless Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 112 |
Europe, Middle East and Africa | Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 41,412 |
Europe, Middle East and Africa | Point in Time | Industrial Automation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 22,573 |
Europe, Middle East and Africa | Point in Time | Wireless Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 1,041 |
Europe, Middle East and Africa | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 7,963 |
Europe, Middle East and Africa | Over Time | Industrial Automation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 143 |
Europe, Middle East and Africa | Over Time | Wireless Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 227 |
Asia Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 4,269 |
Asia Pacific | Wireless Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 188 |
Asia Pacific | Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 328,455 |
Asia Pacific | Point in Time | Industrial Automation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 11,583 |
Asia Pacific | Point in Time | Wireless Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 13,664 |
Asia Pacific | Over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 43,506 |
Asia Pacific | Over Time | Industrial Automation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 73 |
Asia Pacific | Over Time | Wireless Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 2,296 |
SOC | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total | [1] | 300,766 |
SOC | Americas | Point in Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total | [1] | 9,600 |
SOC | Americas | Over Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total | [1] | 8,791 |
SOC | Europe, Middle East and Africa | Point in Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total | [1] | 12,125 |
SOC | Europe, Middle East and Africa | Over Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total | [1] | 5,214 |
SOC | Asia Pacific | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total | [1] | 3,847 |
SOC | Asia Pacific | Point in Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total | [1] | 224,851 |
SOC | Asia Pacific | Over Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total | [1] | 36,338 |
Memory | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 72,562 |
Memory | Americas | Point in Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 2,862 |
Memory | Americas | Over Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 696 |
Memory | Europe, Middle East and Africa | Point in Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 139 |
Memory | Europe, Middle East and Africa | Over Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 269 |
Memory | Asia Pacific | Point in Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 66,273 |
Memory | Asia Pacific | Over Time | Semiconductor Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 2,323 |
Defense/Aerospace | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 20,142 |
Defense/Aerospace | Americas | Point in Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 11,597 |
Defense/Aerospace | Americas | Over Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 6,188 |
Defense/Aerospace | Europe, Middle East and Africa | Point in Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 1,497 |
Defense/Aerospace | Europe, Middle East and Africa | Over Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 551 |
Defense/Aerospace | Asia Pacific | Point in Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 101 |
Defense/Aerospace | Asia Pacific | Over Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 208 |
Storage Test | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 11,934 |
Storage Test | Americas | Point in Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 279 |
Storage Test | Asia Pacific | Point in Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 10,122 |
Storage Test | Asia Pacific | Over Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 1,533 |
Production Board Test | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 10,943 |
Production Board Test | Americas | Point in Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 1,760 |
Production Board Test | Americas | Over Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 757 |
Production Board Test | Europe, Middle East and Africa | Point in Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 4,037 |
Production Board Test | Europe, Middle East and Africa | Over Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 1,559 |
Production Board Test | Asia Pacific | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 234 |
Production Board Test | Asia Pacific | Point in Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | 1,861 |
Production Board Test | Asia Pacific | Over Time | System Test |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total |  | $ 735 |
[1] | System on a chip ("SOC")

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