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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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