Fair Value Measurements Private Company Investments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018	Jun. 29, 2019
Investments, Debt and Equity Securities [Abstract]
Cost Method Investments	$ 20.9		$ 20.9		$ 20.7
Accumulated gains or losses on private company investments	3.0		3.0		$ 3.6
Unrealized Gain (Loss) on Securities	$ 0.6	$ (0.8)	$ 0.6	$ (0.7)

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=109223946&loc=d3e3602-108585

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