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Financial Instruments, Short-term Investments (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 28, 2019
Jun. 29, 2019
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Dec. 28, 2019  
Debt Securities, Available-for-sale [Abstract]    
Estimated Fair Value   $ 140,990
Debt Securities, Available-for-sale, Amortized Cost $ 62,929 141,031
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 86 68
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 9 109
Debt Securities, Available-for-sale 63,006  
Certificates of deposit    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 0 1,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Debt Securities, Available-for-sale 0 1,000
Corporate debt securities    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 62,929 140,031
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 86 68
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 9 109
Debt Securities, Available-for-sale $ 63,006 $ 139,990