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Investments (Summary of Marketable Investments by Type) (Details) - USD ($) $ in Thousands	Jun. 25, 2017	Jun. 26, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 474,460	$ 432,603
Gross Unrealized Gains	4,144	6,636
Gross Unrealized Losses	(263)	(88)
Estimated Fair Value	478,341	439,151
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	177,890	186,893
Gross Unrealized Gains	2,219	3,562
Gross Unrealized Losses	(68)	(15)
Estimated Fair Value	180,041	190,440
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	175,991	165,766
Gross Unrealized Gains	1,925	3,074
Gross Unrealized Losses	(195)	(73)
Estimated Fair Value	177,721	168,767
Non-U.S. certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	120,379	73,127
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	120,379	73,127
U.S. certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	3,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	0	3,500
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	200	3,317
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 200	$ 3,317

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

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