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Investments (Summary of Short-term Investments by Type) (Details) - USD ($)
$ in Thousands
Sep. 25, 2016
Jun. 26, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Securities, Current $ 461,207 $ 439,151
Amortized Cost 455,178 432,603
Gross Unrealized Gains 6,122 6,636
Gross Unrealized Losses (93) (88)
Estimated Fair Value 461,207 439,151
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Securities, Current 186,310  
Amortized Cost 183,585 186,893
Gross Unrealized Gains 2,775 3,562
Gross Unrealized Losses (50) (15)
Estimated Fair Value 186,310 190,440
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Securities, Current 169,201  
Amortized Cost 165,897 165,766
Gross Unrealized Gains 3,347 3,074
Gross Unrealized Losses (43) (73)
Estimated Fair Value 169,201 168,767
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,802 3,317
Estimated Fair Value 3,802 3,317
U.S. | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Securities, Current 93,103  
Amortized Cost 8,791 3,500
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 8,791 3,500
Non-US [Member] | Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Securities, Current 8,791  
Amortized Cost 93,103 73,127
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 93,103 $ 73,127
Non-US [Member] | Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Securities, Current $ 3,802