Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands	Dec. 24, 2017	Jun. 25, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 480,038	$ 474,460
Gross Unrealized Gains	1,976	4,144
Gross Unrealized Losses	(1,793)	(263)
Estimated Fair Value	480,221	478,341
Available-for-sale Securities, Debt Securities, Current	480,221	478,341
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	178,985	177,890
Gross Unrealized Gains	815	2,219
Gross Unrealized Losses	(1,025)	(68)
Estimated Fair Value	178,775	180,041
Available-for-sale Securities, Debt Securities, Current	178,775
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	172,410	175,991
Gross Unrealized Gains	1,161	1,925
Gross Unrealized Losses	(761)	(195)
Estimated Fair Value	172,810	177,721
Available-for-sale Securities, Debt Securities, Current	172,810
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,921	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7)	0
Estimated Fair Value	3,914	0
Available-for-sale Securities, Debt Securities, Current	3,914
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,088	200
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	2,088	200
Available-for-sale Securities, Debt Securities, Current	2,088
Non-US [Member] \| Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	122,634	120,379
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	122,634	$ 120,379
Available-for-sale Securities, Debt Securities, Current	$ 122,634

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
-Topic 320
-SubTopic 10
-Section 25
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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