The Company and Basis of Presentation (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 29, 2020	Jun. 28, 2020	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Impairment charge	$ 4,500	$ 4,530	$ 0

Amount of impairment loss on investment in equity security without readily determinable fair value.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration