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Investments (Summary of Marketable Investments by Type) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Jun. 24, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 834,249 $ 561,470
Gross Unrealized Gains 2,695 4,349
Gross Unrealized Losses (3,098) (191)
Estimated Fair Value 833,846 565,628
Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 250,206 209,626
Gross Unrealized Gains 817 2,036
Gross Unrealized Losses (1,314) (58)
Estimated Fair Value 249,709 211,604
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 192,147 144,942
Gross Unrealized Gains 1,678 1,848
Gross Unrealized Losses (1,765) (123)
Estimated Fair Value 192,060 146,667
U.S. Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 39,288 68,156
Gross Unrealized Gains 186 450
Gross Unrealized Losses 0 (7)
Estimated Fair Value 39,474 68,599
Non-U.S. certificates of deposit [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 345,000 130,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 345,000 130,000
Non-U.S. Government Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,608 8,746
Gross Unrealized Gains 14 15
Gross Unrealized Losses (19) (3)
Estimated Fair Value $ 7,603 $ 8,758