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Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($)
$ in Thousands
Mar. 26, 2017
Jun. 26, 2016
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 214,238  
After One, Within Five Years 196,280  
After Five, Within Ten Years 64,265  
After Ten Years 0  
Total 474,783 $ 439,151
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 678  
Total 678  
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 46,459  
After One, Within Five Years 108,079  
After Five, Within Ten Years 29,010  
After Ten Years 0  
Total 183,548  
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 50,835  
After One, Within Five Years 83,479  
After Five, Within Ten Years 35,255  
After Ten Years 0  
Total 169,569  
U.S. | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 6,365  
After One, Within Five Years 4,722  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 11,087  
Non-US [Member] | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 109,901  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total $ 109,901