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Goodwill and Acquired Intangibles (Details 1) - USD ($) $ in Thousands | Mar. 28, 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 | $ 540,813 | $ 517,137
Accumulated amortization | (301,696) | (364,262)
Acquired intangibles, net | 239,117 | 152,875
In-process technology | 19,500 | 19,500
Intangible Assets, Gross (Excluding Goodwill) | 560,313 | 536,637
Intangible Assets, Net (Excluding Goodwill) | 258,617 | 172,375
Existing Technology [Member] |  |
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year |  |
Gross carrying amount | 350,238 | 363,142
Accumulated amortization | (196,159) | (245,902)
Acquired intangibles, net | 154,079 | 117,240
Agreements and Relationships [Member] |  |
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year |  |
Gross carrying amount | 179,985 | 146,395
Accumulated amortization | (99,581) | (112,565)
Acquired intangibles, net | 80,404 | 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 | (5,956) | (5,795)
Acquired intangibles, net | $ 4,634 | $ 1,805

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