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Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($)
$ in Thousands
Sep. 24, 2017
Jun. 25, 2017
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 188,617  
After One, Within Five Years 228,529  
After Five, Within Ten Years 55,650  
After Ten Years 0  
Total short-term investments 472,796 $ 478,341
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 2,080  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments 2,080  
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 45,350  
After One, Within Five Years 116,758  
After Five, Within Ten Years 23,132  
After Ten Years 0  
Total short-term investments 185,240  
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 33,399  
After One, Within Five Years 107,050  
After Five, Within Ten Years 32,518  
After Ten Years 0  
Total short-term investments 172,967  
Non-US [Member] | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 107,788  
After One, Within Five Years 4,721  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments $ 112,509