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Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($)
$ in Thousands
Dec. 24, 2017
Jun. 25, 2017
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 123,284  
After One, Within Five Years 239,320  
After Five, Within Ten Years 97,460  
After Ten Years 20,157  
Total short-term investments 480,221 $ 478,341
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 2,088  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments 2,088  
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 1,526  
After One, Within Five Years 130,557  
After Five, Within Ten Years 35,186  
After Ten Years 11,506  
Total short-term investments 178,775  
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 4,759  
After One, Within Five Years 97,126  
After Five, Within Ten Years 62,274  
After Ten Years 8,651  
Total short-term investments 172,810  
US Government Agencies Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 0  
After One, Within Five Years 3,914  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments 3,914  
Non-US [Member] | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 114,911  
After One, Within Five Years 7,723  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments $ 122,634