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Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($)
$ in Thousands
Dec. 27, 2015
Jun. 28, 2015
Schedule of Available-for-sale Securities [Line Items]    
Within One Year $ 219,014  
After One, Within Five Years 239,861  
After Five, Within Ten Years 67,692  
After Ten Years 0  
Total 526,567 $ 573,481
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 17,190  
After One, Within Five Years 143,765  
After Five, Within Ten Years 33,176  
After Ten Years 0  
Total 194,131  
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 33,343  
After One, Within Five Years 95,596  
After Five, Within Ten Years 34,516  
After Ten Years 0  
Total 163,455  
U.S. | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 0  
After One, Within Five Years 500  
After Five, Within Ten Years 0  
After Ten Years 0  
Total 500  
Non-US [Member] | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Within One Year 168,481  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total $ 168,481