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Investments (Contractual Maturities of Marketable Investments) (Details) - USD ($)
$ in Thousands
Jun. 24, 2018
Jun. 25, 2017
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 125,478  
After One, Within Five Years 142,683  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 268,161 $ 478,341
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 24,700  
After One, Within Five Years 84,576  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 109,276 180,041
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 22,534  
After One, Within Five Years 54,223  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 76,757 177,721
U.S. agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 0  
After One, Within Five Years 3,884  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 3,884 0
Certificates of deposit | Non-US [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 77,744  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 77,744 120,379
Certificates of deposit | United States    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 500  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total $ 500 $ 0