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Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($)
$ in Thousands
Sep. 27, 2015
Jun. 28, 2015
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 242,028  
After One, Within Five Years 238,703  
After Five, Within Ten Years 67,982  
After Ten Years 0  
Total 548,713 $ 573,481
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 12,772  
After One, Within Five Years 146,232  
After Five, Within Ten Years 35,025  
After Ten Years 0  
Total 194,029  
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 33,732  
After One, Within Five Years 92,471  
After Five, Within Ten Years 32,957  
After Ten Years 0  
Total 159,160  
Non-U.S. Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 195,524  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total $ 195,524