Goodwill and Acquired Intangibles (Details 1) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	$ 487,940	$ 504,791
Accumulated amortization	(308,055)	(297,456)
Acquired intangibles, net	179,885	207,335
In-process technology	71,500	71,500
Intangible Assets, Gross (Excluding Goodwill)	559,440	576,291
Intangible Assets, Net (Excluding Goodwill)	251,385	278,835
Existing Technology [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	330,756	342,810
Accumulated amortization	(207,198)	(199,529)
Acquired intangibles, net	123,558	143,281
Agreements and Relationships [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	146,466	151,063
Accumulated amortization	(93,186)	(90,675)
Acquired intangibles, net	53,280	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	(7,671)	(7,252)
Acquired intangibles, net	$ 3,047	$ 3,666