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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	Dec. 27, 2015 USD ($)	Jun. 28, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 130,066	$ 99,840
Unrealized Loss, Less than 12 Months	(574)	(484)
Fair Value, Greater than 12 Months	1,768	1,812
Unrealized Loss, Greater than 12 Months	(20)	(15)
Fair Value, Total	131,834	101,652
Unrealized Loss, Total	$ (594)	$ (499)
Number of Securities with an Unrealized Loss, Less than 12 Months	72	54
Number of Securities with an Unrealized Loss, Greater than 12 Months	1	1
Number of Securities with an Unrealized Loss, Total	73	55
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 48,678	$ 53,204
Unrealized Loss, Less than 12 Months	(134)	(341)
Fair Value, Greater than 12 Months	0	0
Unrealized Loss, Greater than 12 Months	0	0
Fair Value, Total	48,678	53,204
Unrealized Loss, Total	(134)	(341)
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	81,388	46,636
Unrealized Loss, Less than 12 Months	(440)	(143)
Fair Value, Greater than 12 Months	1,768	1,812
Unrealized Loss, Greater than 12 Months	(20)	(15)
Fair Value, Total	83,156	48,448
Unrealized Loss, Total	$ (460)	$ (158)

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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.

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