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Investments (Summary of Short-term Investments by Type) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2014
Jun. 29, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 904,744 $ 870,993
Gross Unrealized Gains 4,242 4,775
Gross Unrealized Losses (443) (126)
Estimated Fair Value 908,543 875,642
Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 295,437 291,869
Gross Unrealized Gains 2,405 2,323
Gross Unrealized Losses (24) (12)
Estimated Fair Value 297,818 294,180
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 214,055 200,177
Gross Unrealized Gains 1,690 2,283
Gross Unrealized Losses (419) (114)
Estimated Fair Value 215,326 202,346
U.S. Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 18,950 18,994
Gross Unrealized Gains 129 141
Gross Unrealized Losses 0 0
Estimated Fair Value 19,079 19,135
Non-U.S. Certificates of Deposit [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 373,303 352,928
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 373,303 352,928
Non-U.S. Government Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,999 7,025
Gross Unrealized Gains 18 28
Gross Unrealized Losses 0 0
Estimated Fair Value $ 3,017 $ 7,053