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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 | 9 Months Ended
--- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 582,038 | $ 566,848 | $ 1,640,315 | $ 1,581,244
Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 397,737 | 417,297 | 1,113,489 | 1,150,712
System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 73,305 | 49,606 | 204,934 | 162,308
Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 68,892 | 65,913 | 209,753 | 176,803
Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 42,264 | 34,304 | 112,541 | 92,023
Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | (160) | (272) | (402) | (602)
Americas | Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 61,604 | 54,810 | 180,802 | 153,293
Americas | Point in Time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 5,621 | 3,820 | 12,961 | 13,515
Americas | Point in Time | Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | (160) | (272) | (402) | (602)
Americas | Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 16,932 | 16,825 | 51,929 | 50,820
Americas | Over Time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 723 | 146 | 1,550 | 379
Europe, Middle East and Africa | Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 44,052 | 45,788 | 138,225 | 132,206
Europe, Middle East and Africa | Point in Time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,220 | 1,504 | 2,575 | 2,570
Europe, Middle East and Africa | Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 8,648 | 8,709 | 25,519 | 25,650
Europe, Middle East and Africa | Over Time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 48 | 318 | 140 | 802
Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,453 | 2,290 | 4,852 | 10,183
Asia Pacific | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 75 | 171 | 140 | 684
Asia Pacific | Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 403,345 | 393,979 | 1,100,453 | 1,079,239
Asia Pacific | Point in Time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 33,032 | 26,851 | 91,029 | 68,180
Asia Pacific | Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 46,004 | 44,447 | 138,535 | 129,853
Asia Pacific | Over Time | Wireless Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,545 | 1,494 | 4,146 | 5,893
SOC | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 325,766 | 330,407 | 934,987 | 924,702
SOC | Americas | Point in Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 6,307 | 8,866 | 21,830 | 30,577
SOC | Americas | Over Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 8,497 | 8,810 | 24,862 | 26,536
SOC | Europe, Middle East and Africa | Point in Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 6,894 | 9,728 | 27,934 | 32,079
SOC | Europe, Middle East and Africa | Over Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 5,189 | 5,336 | 15,681 | 16,240
SOC | Asia Pacific | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,290 | 2,047 | 4,487 | 9,162
SOC | Asia Pacific | Point in Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 259,909 | 258,898 | 727,035 | 702,097
SOC | Asia Pacific | Over Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 37,680 | 36,722 | 113,158 | 108,011
Memory | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 71,971 | 86,890 | 178,502 | 226,010
Memory | Americas | Point in Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 3,464 | 4,600 | 19,574 | 10,291
Memory | Americas | Over Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 621 | 686 | 2,056 | 2,092
Memory | Europe, Middle East and Africa | Point in Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 274 | 2,080 | 2,443 | 3,066
Memory | Europe, Middle East and Africa | Over Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 255 | 301 | 819 | 824
Memory | Asia Pacific | Point in Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 63,483 | 76,429 | 143,163 | 202,336
Memory | Asia Pacific | Over Time | Semiconductor Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 3,874 | 2,794 | 10,447 | 7,401
Defense/Aerospace | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 30,284 | 23,269 | 78,336 | 66,533
Defense/Aerospace | Americas | Point in Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 22,861 | 15,423 | 54,870 | 42,276
Defense/Aerospace | Americas | Over Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 5,814 | 6,037 | 19,116 | 18,462
Defense/Aerospace | Europe, Middle East and Africa | Point in Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 742 | 161 | 992 | 2,104
Defense/Aerospace | Europe, Middle East and Africa | Over Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 469 | 505 | 1,442 | 1,596
Defense/Aerospace | Asia Pacific | Point in Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 99 | 931 | 525 | 1,417
Defense/Aerospace | Asia Pacific | Over Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 299 | 212 | 1,391 | 678
Storage Test | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 26,424 | 12,032 | 80,362 | 57,224
Storage Test | Americas | Point in Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,232 | 0 | 7,528 | 284
Storage Test | Asia Pacific | Point in Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 22,696 | 9,916 | 66,974 | 51,863
Storage Test | Asia Pacific | Over Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,496 | 2,116 | 5,860 | 5,077
Production Board Test | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 16,597 | 14,305 | 46,236 | 38,551
Production Board Test | Americas | Point in Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,165 | 2,625 | 6,760 | 5,814
Production Board Test | Americas | Over Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 796 | 789 | 2,317 | 2,342
Production Board Test | Europe, Middle East and Africa | Point in Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 4,354 | 3,223 | 12,391 | 12,109
Production Board Test | Europe, Middle East and Africa | Over Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,613 | 1,510 | 4,782 | 4,781
Production Board Test | Asia Pacific | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 88 | 72 | 225 | 337
Production Board Test | Asia Pacific | Point in Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 6,751 | 5,201 | 17,235 | 10,804
Production Board Test | Asia Pacific | Over Time | System Test |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 830 | 885 | 2,526 | 2,364
Universal Robots (UR) | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 58,458 | 58,552 | 177,673 | 164,247
Universal Robots (UR) | Americas | Point in Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 16,294 | 17,834 | 48,529 | 48,025
Universal Robots (UR) | Americas | Over Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 293 | 190 | 793 | 431
Universal Robots (UR) | Europe, Middle East and Africa | Point in Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 25,557 | 26,445 | 78,007 | 75,631
Universal Robots (UR) | Europe, Middle East and Africa | Over Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 459 | 282 | 1,274 | 675
Universal Robots (UR) | Asia Pacific | Point in Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 15,575 | 13,656 | 48,284 | 39,135
Universal Robots (UR) | Asia Pacific | Over Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 280 | 145 | 786 | 350
MiR | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 9,631 | 6,544 | 29,243 | 11,053
MiR | Americas | Point in Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,820 | 1,810 | 9,152 | 3,009
MiR | Europe, Middle East and Africa | Point in Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 5,011 | 2,647 | 13,883 | 4,647
MiR | Asia Pacific | Point in Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,800 | 2,087 | 6,208 | 3,397
Energid Technologies Corporation | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 803 | 817 | 2,837 | 1,503
Energid Technologies Corporation | Americas | Point in Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total |  | 104 |  | 104
Energid Technologies Corporation | Americas | Over Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 188 | 167 | 1,235 | 578
Energid Technologies Corporation | Europe, Middle East and Africa | Over Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 615 | 457 | 1,381 | 732
Energid Technologies Corporation | Asia Pacific | Point in Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total |  | 10 |  | 10
Energid Technologies Corporation | Asia Pacific | Over Time | Industrial Automation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total |  | $ 79 | $ 221 | $ 79

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