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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. 25, 2018 USD ($)	Jun. 25, 2017 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 162,926	$ 84,220
Unrealized Loss, Less than 12 Months	(1,983)	(263)
Fair Value, Greater than 12 Months	5,159	0
Unrealized Loss, Greater than 12 Months	(145)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	168,085	84,220
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 2,128	$ 263
Number of Securities with an Unrealized Loss, Less than 12 Months	134	67
Number of Securities with an Unrealized Loss, Greater than 12 Months	6	0
Number of Securities with an Unrealized Loss, Total	140	67
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 98,251	$ 26,816
Unrealized Loss, Less than 12 Months	(988)	(68)
Fair Value, Greater than 12 Months	3,666	0
Unrealized Loss, Greater than 12 Months	(87)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	101,917	26,816
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,075	68
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	56,160	57,404
Unrealized Loss, Less than 12 Months	(967)	(195)
Fair Value, Greater than 12 Months	1,493	0
Unrealized Loss, Greater than 12 Months	(58)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	57,653	57,404
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,025	195
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	8,515	0
Unrealized Loss, Less than 12 Months	(28)	0
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	8,515	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 28	$ 0

X

- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
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