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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	Mar. 31, 2019 USD ($)	Jun. 24, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	$ 49,448	$ 162,807
Unrealized Loss, Less than 12 Months	(20)	(1,987)
Fair Value, Greater than 12 Months	105,514	5,128
Unrealized Loss, Greater than 12 Months	(570)	(140)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	154,962	167,935
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 590	$ 2,127
Number of Securities with an Unrealized Loss, Less than 12 Months	54	151
Number of Securities with an Unrealized Loss, Greater than 12 Months	85	6
Number of Securities with an Unrealized Loss, Total	139	157
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	$ 2,406	$ 97,470
Unrealized Loss, Less than 12 Months	0	(861)
Fair Value, Greater than 12 Months	68,677	3,642
Unrealized Loss, Greater than 12 Months	(297)	(78)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	71,083	101,112
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	297	939
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	31,144	61,453
Unrealized Loss, Less than 12 Months	(17)	(1,088)
Fair Value, Greater than 12 Months	32,930	1,486
Unrealized Loss, Greater than 12 Months	(257)	(62)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	64,074	62,939
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	274	1,150
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	5,788	3,884
Unrealized Loss, Less than 12 Months	(1)	(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	5,788	3,884
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1	38
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 Months	10,110	0
Unrealized Loss, Less than 12 Months	(2)	0
Fair Value, Greater than 12 Months	3,907	0
Unrealized Loss, Greater than 12 Months	(16)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14,017	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 18	$ 0

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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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-SubTopic 10
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