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Investments (Contractual Maturities of Marketable Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Jun. 24, 2012
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 372,916  
After One, Within Five Years 383,197  
After Five, Within Ten Years 2,500  
After Ten Years 0  
Total 758,613 565,628
Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 59,355  
After One, Within Five Years 189,037  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 248,392  
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 25,404  
After One, Within Five Years 151,426  
After Five, Within Ten Years 2,500  
After Ten Years 0  
Total 179,330  
Certificates of Deposit [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 265,000  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 265,000  
U.S. Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 20,145  
After One, Within Five Years 36,578  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 56,723  
Non-U.S. Government Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 3,012  
After One, Within Five Years 6,156  
After Five, Within Ten Years 0  
After Ten Years 0  
Total $ 9,168