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Investments (Contractual Maturities of Marketable Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 25, 2012
Jun. 26, 2011
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 254,205  
After One, Within Five Years 264,832  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 519,037 695,199
Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 86,060  
After One, Within Five Years 118,382  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 204,442  
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 80,333  
After One, Within Five Years 101,384  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 181,717  
Certificates of Deposit [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 65,000  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 65,000  
U.S. Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 21,802  
After One, Within Five Years 42,965  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 64,767  
Non-U.S. Government Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 1,010  
After One, Within Five Years 2,101  
After Five, Within Ten Years 0  
After Ten Years 0  
Total $ 3,111