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Investments (Summary of Marketable Investments by Type) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 29, 2014
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 870,993 $ 834,249
Gross Unrealized Gains 4,775 2,695
Gross Unrealized Losses (126) (3,098)
Estimated Fair Value 875,642 833,846
Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 291,869 250,206
Gross Unrealized Gains 2,323 817
Gross Unrealized Losses (12) (1,314)
Estimated Fair Value 294,180 249,709
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 200,177 192,147
Gross Unrealized Gains 2,283 1,678
Gross Unrealized Losses (114) (1,765)
Estimated Fair Value 202,346 192,060
U.S. Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 18,994 39,288
Gross Unrealized Gains 141 186
Gross Unrealized Losses 0 0
Estimated Fair Value 19,135 39,474
Non-U.S. certificates of deposit [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 352,928 345,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 352,928 345,000
Non-U.S. Government Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,025 7,608
Gross Unrealized Gains 28 14
Gross Unrealized Losses 0 (19)
Estimated Fair Value $ 7,053 $ 7,603