Goodwill and Acquired Intangibles (Details 1) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	$ 488,445	$ 504,791
Accumulated amortization	(295,018)	(297,456)
Acquired intangibles, net	193,427	207,335
In-process technology	71,500	71,500
Intangible Assets, Gross (Excluding Goodwill)	559,945	576,291
Intangible Assets, Net (Excluding Goodwill)	264,927	278,835
Existing Technology [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	331,162	342,810
Accumulated amortization	(197,877)	(199,529)
Acquired intangibles, net	133,285	143,281
Agreements and Relationships [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	146,565	151,063
Accumulated amortization	(89,725)	(90,675)
Acquired intangibles, net	56,840	60,388
Tradenames Trademarks And Patents [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	10,718	10,918
Accumulated amortization	(7,416)	(7,252)
Acquired intangibles, net	$ 3,302	$ 3,666