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Investments (Contractual Maturities of Marketable Investments) (Details) - USD ($)
$ in Thousands
Jun. 28, 2015
Jun. 29, 2014
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 266,203  
After One, Within Five Years 242,052  
After Five, Within Ten Years 65,226  
After Ten Years 0  
Total 573,481 $ 875,642
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 12,575  
After One, Within Five Years 147,470  
After Five, Within Ten Years 34,725  
After Ten Years 0  
Total 194,770  
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 28,422  
After One, Within Five Years 94,582  
After Five, Within Ten Years 30,501  
After Ten Years 0  
Total 153,505  
Non-U.S. certificates of deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 225,206  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total $ 225,206