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Investments (Summary of Short-term Investments by Type) (Details) - USD ($)
$ in Thousands
Mar. 27, 2016
Jun. 28, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 500,710 $ 572,160
Gross Unrealized Gains 4,539 1,820
Gross Unrealized Losses (361) (499)
Estimated Fair Value 504,888 573,481
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 188,312 194,123
Gross Unrealized Gains 2,563 988
Gross Unrealized Losses (50) (341)
Estimated Fair Value 190,825 194,770
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 163,898 152,831
Gross Unrealized Gains 1,976 832
Gross Unrealized Losses (311) (158)
Estimated Fair Value 165,563 153,505
U.S. | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,500 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 3,500 0
Non-US [Member] | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 145,000 225,206
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value $ 145,000 $ 225,206