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Financial Instruments, Short-term Investments (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 24, 2016
Jun. 27, 2015
Jun. 25, 2016
Available-for-sale Securities [Abstract]      
Amortized Cost $ 175,157,000   $ 124,950,000
Gross Unrealized Gain 284,000   489,000
Gross Unrealized Loss 0   0
Estimated Fair Value 175,441,000   125,439,000
US Treasury Bills [Member]      
Available-for-sale Securities [Abstract]      
Amortized Cost 175,157,000   124,950,000
Gross Unrealized Gain 284,000   489,000
Gross Unrealized Loss 0   0
Estimated Fair Value 175,441,000   $ 125,439,000
Short-Term Investment [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Impairment charges $ 0 $ 0