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Financial Instruments, Short-term Investments (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 26, 2020
Jun. 27, 2020
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Dec. 26, 2020  
Debt Securities, Available-for-sale [Abstract]    
Estimated Fair Value   $ 35,536
Debt Securities, Available-for-sale, Amortized Cost $ 8,875 35,417
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4 137
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 18
Debt Securities, Available-for-sale 8,879  
Corporate debt securities    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 8,875 35,417
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4 137
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 18
Debt Securities, Available-for-sale $ 8,879 $ 35,536