Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Oct. 02, 2016	Jul. 03, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Segment Reporting Information [Line Items]
Goodwill impairment					$ 254,946
Intangible assets impairment					83,339
Restructuring and other		$ 12,177		$ 261	16,372	$ (124)
Contingent consideration adjustment		8,000			10,451	(2,600)
Property insurance recovery					(5,363)
Other (income) expense, net-Gain from the sale of an equity investment						(5,406)
Universal Robots
Segment Reporting Information [Line Items]
Contingent consideration adjustment		8,000			9,900
Acquisition related costs				100		1,100
Avionics Interface Technologies, LLC
Segment Reporting Information [Line Items]
Contingent consideration adjustment				(1,000)	600	(1,000)
ZTEC Instruments, Inc.
Segment Reporting Information [Line Items]
Contingent consideration adjustment						(1,600)
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues-inventory charge		2,351		1,697	8,270	8,637
Restructuring and other		2,047		194	2,798	499
Total		4,398		1,891	11,068	9,136
Corporate And Eliminations
Segment Reporting Information [Line Items]
Total		7,974		(856)	10,452	(6,902)
Corporate And Eliminations | Restructuring and other
Segment Reporting Information [Line Items]
Property insurance recovery		(312)			(5,363)
Corporate And Eliminations | Other (income) expense, net
Segment Reporting Information [Line Items]
Other (income) expense, net-Gain from the sale of an equity investment						(5,406)
Corporate And Eliminations | Impairment of fixed assets and expenses related to the Japan earthquake | Restructuring and other
Segment Reporting Information [Line Items]
Building impairment and other expenses		312			5,363
Corporate And Eliminations | Universal Robots | Restructuring and other
Segment Reporting Information [Line Items]
Contingent consideration adjustment		7,974			9,902
Acquisition related costs				144		1,104
Corporate And Eliminations | Avionics Interface Technologies, LLC | Restructuring and other
Segment Reporting Information [Line Items]
Contingent consideration adjustment				(1,000)	550	(1,000)
Corporate And Eliminations | ZTEC Instruments, Inc. | Restructuring and other
Segment Reporting Information [Line Items]
Contingent consideration adjustment						(1,600)
Industrial Automation
Segment Reporting Information [Line Items]
Cost of revenues-inventory step-up	[1]			972		1,567
Restructuring and other		532			532
Total		532		972	532	1,567
Wireless Test
Segment Reporting Information [Line Items]
Goodwill impairment			$ 254,946		254,946
Intangible assets impairment			$ 83,000		83,339
Cost of revenues-inventory charge		561		901	6,437	2,077
Restructuring and other		1,672			2,639
Total		$ 2,233		$ 901	$ 347,361	$ 2,077

[1] Included in the cost of revenues for the three and nine months ended October 4, 2015 is the cost for purchase accounting inventory step-up.