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Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($)
$ in Thousands
Sep. 25, 2016
Jun. 26, 2016
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 168,826  
After One, Within Five Years 221,805  
After Five, Within Ten Years 70,576  
After Ten Years 0  
Total 461,207 $ 439,151
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 3,802  
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 43,513  
After One, Within Five Years 110,598  
After Five, Within Ten Years 32,199  
After Ten Years 0  
Total 186,310  
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 22,617  
After One, Within Five Years 108,207  
After Five, Within Ten Years 38,377  
After Ten Years 0  
Total 169,201  
U.S. | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 93,103  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 93,103  
Non-US [Member] | Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total 3,802  
Non-US [Member] | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 5,791  
After One, Within Five Years 3,000  
After Five, Within Ten Years 0  
After Ten Years 0  
Total $ 8,791