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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 1,204,163	$ 1,216,425
Accumulated impairment losses	(762,566)	(762,566)
Foreign currency translation adjustment	(12,262)
Goodwill	441,597	453,859
Industrial Automation
Goodwill [Line Items]
Goodwill	421,561	433,752
Accumulated impairment losses	0	0
Foreign currency translation adjustment	(12,191)
Goodwill	421,561	433,752
Wireless Test
Goodwill [Line Items]
Goodwill	361,819	361,819
Accumulated impairment losses	(353,843)	(353,843)
Foreign currency translation adjustment	0
Goodwill	7,976	7,976
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,084	262,155
Accumulated impairment losses	(260,540)	(260,540)
Foreign currency translation adjustment	(71)
Goodwill	1,544	1,615
System Test
Goodwill [Line Items]
Goodwill	158,699	158,699
Accumulated impairment losses	(148,183)	(148,183)
Foreign currency translation adjustment	0
Goodwill	$ 10,516	$ 10,516

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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+ References

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