Investments (Summary of Marketable Investments by Type) (Details) - USD ($) $ in Thousands	Jun. 24, 2018	Jun. 25, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 270,235	$ 474,460
Gross Unrealized Gains	53	4,144
Gross Unrealized Losses	(2,127)	(263)
Short-term investments	268,161	478,341
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	110,198	177,890
Gross Unrealized Gains	17	2,219
Gross Unrealized Losses	(939)	(68)
Short-term investments	109,276	180,041
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	77,871	175,991
Gross Unrealized Gains	36	1,925
Gross Unrealized Losses	(1,150)	(195)
Short-term investments	76,757	177,721
U.S. agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,922	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(38)	0
Short-term investments	3,884	0
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	200
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments	0	200
Non-US [Member] \| Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	77,744	120,379
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments	77,744	120,379
United States \| Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	500	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments	$ 500	$ 0

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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