Goodwill and Acquisition-Related Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 28, 2019	Mar. 30, 2019
Gross and net amounts of goodwill and of acquisition-related intangibles
Goodwill	$ 620,852	$ 340,718
Total acquisition-related intangibles, gross	361,882	210,976
Less accumulated amortization	(141,825)	(130,253)
Acquisition-related intangibles, net	220,057	80,723
Total	155,150
Core Technology [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	201,216	107,250
Less accumulated amortization	(91,614)	(82,611)
Total	$ 109,602	24,639
Weighted-Average Amortization Life	4 years 4 months 24 days
Other Intangibles [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	$ 95,759	51,016
Less accumulated amortization	(50,211)	(47,642)
Total	$ 45,548	3,374
Weighted-Average Amortization Life	4 years 3 months 18 days
In-process research and development
Gross and net amounts of goodwill and of acquisition-related intangibles
In-process research and development	$ 64,907	$ 52,710

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Schedule of goodwill and intangible assets.

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