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Investments (Summary of Marketable Investments by Type) (Details) - USD ($) $ in Thousands	Jun. 26, 2016	Jun. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 432,603	$ 572,160
Gross Unrealized Gains	6,636	1,820
Gross Unrealized Losses	(88)	(499)
Estimated Fair Value	439,151	573,481
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	186,893	194,123
Gross Unrealized Gains	3,562	988
Gross Unrealized Losses	(15)	(341)
Estimated Fair Value	190,440	194,770
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	165,766	152,831
Gross Unrealized Gains	3,074	832
Gross Unrealized Losses	(73)	(158)
Estimated Fair Value	168,767	153,505
Non-U.S. certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	73,127	225,206
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	73,127	$ 225,206
U.S. certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,500
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	3,500
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,317
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	$ 3,317

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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