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Financial Instruments, Short-term Investments (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 26, 2015
Jun. 27, 2015
Available-for-sale Securities [Abstract]    
Amortized Cost $ 100,076,000 $ 75,021,000
Gross Unrealized Gains 209,000 133,000
Gross Unrealized Loss 0 0
Estimated Fair Value 100,285,000 75,154,000
Short-Term Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 0 0
US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Amortized Cost 100,076,000 75,021,000
Gross Unrealized Gains 209,000 133,000
Gross Unrealized Loss 0 0
Estimated Fair Value $ 100,285,000 $ 75,154,000