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Business Acquisitions - Chan Test Preliminary Purchase Price (Details) - USD ($) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Oct. 29, 2014 | Sep. 26, 2015 | Sep. 27, 2014 | Dec. 27, 2014
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 418,245 |  | $ 321,077
Total purchase price allocation |  | $ 211,974 | $ 183,151 |
ChanTest |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets (excluding cash) | $ 4,669 |  |  |
Property, plant and equipment | 1,637 |  |  |
Definite-lived intangible assets | 23,920 |  |  |
Goodwill | 34,775 |  |  |
Current liabilities | (3,486) |  |  |
Long-term liabilities | (9,486) |  |  |
Total purchase price allocation | $ 52,029 |  |  |

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