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Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jun. 24, 2018
Debt Securities, Available-for-sale [Line Items]    
Within One Year $ 184,195  
After One, Within Five Years 148,916  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments 333,111 $ 268,161
Commercial Paper [Member]    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 1,193  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments 1,193  
Municipal Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 37,749  
After One, Within Five Years 58,153  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments 95,902  
Corporate Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 61,245  
After One, Within Five Years 90,062  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments 151,307  
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 3,988  
After One, Within Five Years 701  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments 4,689  
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 28,961  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments 28,961  
Non-US [Member] | Certificates of Deposit [Member]    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 51,059  
After One, Within Five Years 0  
After Five, Within Ten Years 0  
After Ten Years 0  
Total short-term investments $ 51,059