Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands	Sep. 27, 2015	Jun. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 546,110	$ 572,160
Gross Unrealized Gains	2,824	1,820
Gross Unrealized Losses	(221)	(499)
Estimated Fair Value	548,713	573,481
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	192,470	194,123
Gross Unrealized Gains	1,650	988
Gross Unrealized Losses	(91)	(341)
Estimated Fair Value	194,029	194,770
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	158,116	152,831
Gross Unrealized Gains	1,174	832
Gross Unrealized Losses	(130)	(158)
Estimated Fair Value	159,160	153,505
Non-U.S. Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	195,524	225,206
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 195,524	$ 225,206