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Investments (Contractual Maturities of Marketable Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 23, 2012
Jun. 24, 2012
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 368,421  
After One, Within Five Years 284,011  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 652,432 565,628
Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 109,450  
After One, Within Five Years 129,469  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 238,919  
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 40,096  
After One, Within Five Years 104,907  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 145,003  
Certificates of Deposit [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 185,000  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 185,000  
U.S. Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 29,334  
After One, Within Five Years 43,938  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 73,272  
Non-U.S. Government Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 4,541  
After One, Within Five Years 5,697  
After Five, Within Ten Years 0  
After Ten Years 0  
Total $ 10,238