Fair Value Measurements Private Company Investments (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 26, 2020	Jun. 27, 2020
Investments, Debt and Equity Securities [Abstract]
Cost Method Investments	$ 21.2	$ 20.6
Accumulated gains or losses on private company investments	(3.8)	$ 4.3
Unrealized Gain (Loss) on Securities	$ 0.5

Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Name:	us-gaap_UnrealizedGainLossOnSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration