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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. 23, 2018 USD ($)	Jun. 24, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	$ 241,101	$ 162,807
Unrealized Loss, Less than 12 Months	(1,712)	(1,987)
Fair Value, Greater than 12 Months	27,887	5,128
Unrealized Loss, Greater than 12 Months	(739)	(140)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	268,988	167,935
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (2,451)	$ (2,127)
Number of Securities with an Unrealized Loss, Less than 12 Months	231	151
Number of Securities with an Unrealized Loss, Greater than 12 Months	27	6
Number of Securities with an Unrealized Loss, Total	258	157
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	$ 84,371	$ 97,470
Unrealized Loss, Less than 12 Months	(838)	(861)
Fair Value, Greater than 12 Months	15,303	3,642
Unrealized Loss, Greater than 12 Months	(384)	(78)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	99,674	101,112
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1,222)	(939)
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	106,340	61,453
Unrealized Loss, Less than 12 Months	(804)	(1,088)
Fair Value, Greater than 12 Months	12,584	1,486
Unrealized Loss, Greater than 12 Months	(355)	(62)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	118,924	62,939
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1,159)	(1,150)
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	6,156	3,884
Unrealized Loss, Less than 12 Months	(10)	(38)
Fair Value, Greater than 12 Months	0	0
Unrealized Loss, Greater than 12 Months	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6,156	3,884
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(10)	$ (38)
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	44,234
Unrealized Loss, Less than 12 Months	(60)
Fair Value, Greater than 12 Months	0
Unrealized Loss, Greater than 12 Months	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	44,234
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (60)

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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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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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