Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands	Mar. 25, 2018	Jun. 25, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 302,325	$ 474,460
Gross Unrealized Gains	42	4,144
Gross Unrealized Losses	(2,128)	(263)
Estimated Fair Value	300,239	478,341
Available-for-sale Securities, Debt Securities, Current	300,239	478,341
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	110,504	177,890
Gross Unrealized Gains	6	2,219
Gross Unrealized Losses	(1,122)	(68)
Estimated Fair Value	109,388	180,041
Available-for-sale Securities, Debt Securities, Current	109,388
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	68,238	175,991
Gross Unrealized Gains	36	1,925
Gross Unrealized Losses	(978)	(195)
Estimated Fair Value	67,296	177,721
Available-for-sale Securities, Debt Securities, Current	67,296
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	(28)	0
Estimated Fair Value	3,893	0
Available-for-sale Securities, Debt Securities, Current	3,893
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,096	200
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	2,096	200
Available-for-sale Securities, Debt Securities, Current	2,096
Non-US [Member] \| Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	117,566	120,379
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	117,566	$ 120,379
Available-for-sale Securities, Debt Securities, Current	$ 117,566

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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