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Investments (Summary of Marketable Investments by Type) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 30, 2012
Jun. 24, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 702,174 $ 561,470
Gross Unrealized Gains 4,381 4,349
Gross Unrealized Losses (360) (191)
Estimated Fair Value 706,195 565,628
Municipal Bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 236,819 209,626
Gross Unrealized Gains 1,442 2,036
Gross Unrealized Losses (311) (58)
Estimated Fair Value 237,950 211,604
Corporate Bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 158,563 144,942
Gross Unrealized Gains 2,467 1,848
Gross Unrealized Losses (49) (123)
Estimated Fair Value 160,981 146,667
Certificates of Deposit [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 225,000 130,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 225,000 130,000
U.S. Agency Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 71,620 68,156
Gross Unrealized Gains 440 450
Gross Unrealized Losses 0 (7)
Estimated Fair Value 72,060 68,599
Non-U.S. Government Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 10,172 8,746
Gross Unrealized Gains 32 15
Gross Unrealized Losses 0 (3)
Estimated Fair Value $ 10,204 $ 8,758