Goodwill and Acquisition-Related Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 29, 2019	Mar. 30, 2019
Gross and net amounts of goodwill and of acquisition-related intangibles
Goodwill	$ 354,248	$ 340,718
Total acquisition-related intangibles, gross	229,167	210,976
Less accumulated amortization	(133,922)	(130,253)
Acquisition-related intangibles, net	95,245	80,723
Total	78,158
Core Technology [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	159,960	107,250
Less accumulated amortization	(85,880)	(82,611)
Total	$ 74,080	24,639
Weighted-Average Amortization Life	4 years 9 months 18 days
Other Intangibles [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	$ 52,120	51,016
Less accumulated amortization	(48,042)	(47,642)
Total	$ 4,078	3,374
Weighted-Average Amortization Life	2 years 1 month 6 days
In-process research and development
Gross and net amounts of goodwill and of acquisition-related intangibles
In-process research and development	$ 17,087	$ 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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