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Investments (Schedule of Investment Securities, Aggregated by Investment Type and Length of Time) (Details) $ in Thousands	12 Months Ended
	Jun. 25, 2017 USD ($)	Jun. 26, 2016 USD ($)	Jun. 28, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 84,220	$ 30,514
Unrealized Loss, Less than 12 Months	(263)	(82)
Fair Value, Greater than 12 Months	0	3,535
Unrealized Loss, Greater than 12 Months	0	(6)
Fair Value, Total	84,220	34,049
Unrealized Loss, Total	$ (263)	$ (88)
Number of securities with an unrealized loss, Less than 12 Months	67	22
Number of securities with an unrealized loss, Greater than 12 Months	0	3
Number of securities with an unrealized loss, Total	67	25
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 93	$ 238	$ 925
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	26,816	2,936
Unrealized Loss, Less than 12 Months	(68)	(9)
Fair Value, Greater than 12 Months	0	3,535
Unrealized Loss, Greater than 12 Months	0	(6)
Fair Value, Total	26,816	6,471
Unrealized Loss, Total	(68)	(15)
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	57,404	27,578
Unrealized Loss, Less than 12 Months	(195)	(73)
Fair Value, Greater than 12 Months	0	0
Unrealized Loss, Greater than 12 Months	0	0
Fair Value, Total	57,404	27,578
Unrealized Loss, Total	$ (195)	$ (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.

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-Section 50
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