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Investments (Contractual Maturities of Marketable Investments) (Details) (USD $)
In Thousands
Jun. 26, 2011
Jun. 27, 2010
Within One Year $ 252,932  
After One, Within Five Years 441,972  
After Five, Within Ten Years    
After Ten Years 295  
Total 695,199 668,974
Municipal Bonds [Member]
    
Within One Year 149,533  
After One, Within Five Years 245,865  
After Five, Within Ten Years    
After Ten Years    
Total 395,398 445,038
Corporate Bonds [Member]
    
Within One Year 79,127  
After One, Within Five Years 130,311  
After Five, Within Ten Years    
After Ten Years    
Total 209,438 122,449
Municipal Variable Rate Demand Notes [Member]
    
After Five, Within Ten Years    
After Ten Years 295  
Total 295 15,684
Certificates of Deposit [Member]
    
Within One Year 5,011  
After One, Within Five Years 5,004  
After Five, Within Ten Years    
After Ten Years    
Total 10,015  
Commercial Paper [Member]
    
Within One Year 4,999  
After Five, Within Ten Years    
After Ten Years    
Total 4,999  
U.S. Government Securities [Member]
    
Total   7,609
Non-U.S. Government Securities [Member]
    
Within One Year 5,000  
After One, Within Five Years 2,005  
After Five, Within Ten Years    
After Ten Years    
Total 7,005 5,080
U.S. Agency Securities [Member]
    
Within One Year 9,262  
After One, Within Five Years 58,787  
After Five, Within Ten Years    
After Ten Years    
Total $ 68,049 $ 73,114