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Investments (Summary of Marketable Investments by Type) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2013
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 912,690 $ 834,249
Gross Unrealized Gains 3,483 2,695
Gross Unrealized Losses (1,110) (3,098)
Estimated Fair Value 915,063 833,846
Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 278,331 250,206
Gross Unrealized Gains 1,604 817
Gross Unrealized Losses (151) (1,314)
Estimated Fair Value 279,784 249,709
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 208,636 192,147
Gross Unrealized Gains 1,660 1,678
Gross Unrealized Losses (957) (1,765)
Estimated Fair Value 209,339 192,060
U.S. Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 31,157 39,288
Gross Unrealized Gains 199 186
Gross Unrealized Losses 0 0
Estimated Fair Value 31,356 39,474
Non-U.S. Certificates of Deposit [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 386,000 345,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 386,000 345,000
Non-U.S. Government Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 8,566 7,608
Gross Unrealized Gains 20 14
Gross Unrealized Losses (2) (19)
Estimated Fair Value $ 8,584 $ 7,603