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Goodwill and Acquired Intangibles (Details 1) - USD ($) $ in Thousands | Jun. 27, 2020 | Dec. 28, 2019
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Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year |  |
Gross carrying amount |  | $ 517,137
Accumulated amortization | $ (317,754) | (364,262)
Acquired intangibles, net | 242,543 | 152,875
In-process technology |  | 19,500
Intangible Assets, Gross (Excluding Goodwill) | 560,297 | 536,637
Intangible Assets, Net (Excluding Goodwill) | 242,543 | 172,375
Existing Technology [Member] |  |
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year |  |
Gross carrying amount | 369,738 | 363,142
Accumulated amortization | (207,374) | (245,902)
Acquired intangibles, net | 162,364 | 117,240
Agreements and Relationships [Member] |  |
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year |  |
Gross carrying amount | 179,969 | 146,395
Accumulated amortization | (104,159) | (112,565)
Acquired intangibles, net | 75,810 | 33,830
Tradenames Trademarks And Patents [Member] |  |
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year |  |
Gross carrying amount | 10,590 | 7,600
Accumulated amortization | (6,221) | (5,795)
Acquired intangibles, net | $ 4,369 | $ 1,805

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