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Investments (Summary of Gross Unrealized Losses and Estimated Fair Value of Short-term Investments, Aggregated by Investment Type and Length of Time) (Details) $ in Thousands	Sep. 25, 2016 USD ($)	Jun. 26, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 29,635	$ 30,514
Unrealized Loss, Less than 12 Months	(71)	(82)
Fair Value, Greater than 12 Months	4,107	3,535
Unrealized Loss, Greater than 12 Months	(22)	(6)
Fair Value, Total	33,742	34,049
Unrealized Loss, Total	$ (93)	$ (88)
Number of Securities with an Unrealized Loss, Less than 12 Months	30	22
Number of Securities with an Unrealized Loss, Greater than 12 Months	3	3
Number of Securities with an Unrealized Loss, Total	33	25
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 17,003	$ 2,936
Unrealized Loss, Less than 12 Months	(41)	(9)
Fair Value, Greater than 12 Months	1,620	3,535
Unrealized Loss, Greater than 12 Months	(9)	(6)
Fair Value, Total	18,623	6,471
Unrealized Loss, Total	(50)	(15)
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	12,632	27,578
Unrealized Loss, Less than 12 Months	(30)	(73)
Fair Value, Greater than 12 Months	2,487	0
Unrealized Loss, Greater than 12 Months	(13)	0
Fair Value, Total	15,119	27,578
Unrealized Loss, Total	$ (43)	$ (73)

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

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-Publisher FASB
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-Section 50
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