Investments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 28, 2020	Jun. 30, 2019	Jun. 24, 2018
Investments, Debt and Equity Securities [Abstract]
Realized gain on sale of investments, net	$ (2.0)	$ 0.1	$ 0.1

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

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