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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Sep. 27, 2020
Goodwill [Line Items] |  |
Foreign currency translation adjustment | $ 18,970 |
Goodwill | 1,178,997 | $ 1,197,818
Accumulated impairment losses | (762,566) | (762,566)
Goodwill | 416,431 | 435,252
Autoguide LLC |  |
Goodwill [Line Items] |  |
Goodwill acquisition | (149) |
Industrial Automation |  |
Goodwill [Line Items] |  |
Foreign currency translation adjustment | 18,881 |
Goodwill | 396,483 | 415,215
Goodwill | 396,483 | 415,215
Industrial Automation | Autoguide LLC |  |
Goodwill [Line Items] |  |
Goodwill acquisition | (149) |
Wireless Test |  |
Goodwill [Line Items] |  |
Goodwill | 361,819 | 361,819
Accumulated impairment losses | (353,843) | (353,843)
Goodwill | 7,976 | 7,976
Semiconductor Test |  |
Goodwill [Line Items] |  |
Foreign currency translation adjustment | 89 |
Goodwill | 261,996 | 262,085
Accumulated impairment losses | (260,540) | (260,540)
Goodwill | 1,456 | 1,545
System Test |  |
Goodwill [Line Items] |  |
Goodwill | 158,699 | 158,699
Accumulated impairment losses | (148,183) | (148,183)
Goodwill | $ 10,516 | $ 10,516

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