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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 01, 2018 | Feb. 26, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |
Foreign currency translation adjustment | $ 8,035 |  |
Goodwill | 1,038,266 |  | $ 1,014,577
Accumulated impairment losses | (762,566) |  | (762,566)
Goodwill | 275,700 |  | 252,011
Energid Technologies Corporation |  |  |
Goodwill [Line Items] |  |  |
Energid acquisition | 15,654 |  |
Goodwill |  | $ 15,700 |
Wireless Test |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 361,819 |  | 361,819
Accumulated impairment losses | (353,843) |  | (353,843)
Goodwill | 7,976 |  | 7,976
Industrial Automation |  |  |
Goodwill [Line Items] |  |  |
Foreign currency translation adjustment | 8,035 |  |
Goodwill | 257,208 |  | 233,519
Goodwill | 257,208 |  | 233,519
Industrial Automation | Energid Technologies Corporation |  |  |
Goodwill [Line Items] |  |  |
Energid acquisition | 15,654 |  |
System Test |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 158,699 |  | 158,699
Accumulated impairment losses | (148,183) |  | (148,183)
Goodwill | 10,516 |  | 10,516
Semiconductor Test |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 260,540 |  | 260,540
Accumulated impairment losses | $ (260,540) |  | $ (260,540)

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