Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 24, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 332,404	$ 270,235
Gross Unrealized Gains	1,297	53
Gross Unrealized Losses	(590)	(2,127)
Estimated Fair Value	333,111	268,161
Debt Securities, Available-for-sale, Current	333,111	268,161
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	96,029	110,198
Gross Unrealized Gains	170	17
Gross Unrealized Losses	(297)	(939)
Estimated Fair Value	95,902	109,276
Debt Securities, Available-for-sale, Current	95,902
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	151,244	77,871
Gross Unrealized Gains	337	36
Gross Unrealized Losses	(274)	(1,150)
Estimated Fair Value	151,307	76,757
Debt Securities, Available-for-sale, Current	151,307
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,689	3,922
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(1)	(38)
Estimated Fair Value	4,689	3,884
Debt Securities, Available-for-sale, Current	4,689
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28,972	0
Gross Unrealized Gains	7	0
Gross Unrealized Losses	(18)	0
Estimated Fair Value	28,961	0
Debt Securities, Available-for-sale, Current	28,961
Commercial Paper [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,193	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,193	0
Debt Securities, Available-for-sale, Current	1,193
Non-US [Member] \| Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	50,277	77,744
Gross Unrealized Gains	782	0
Gross Unrealized Losses	0	0
Estimated Fair Value	51,059	77,744
Debt Securities, Available-for-sale, Current	51,059
UNITED STATES \| Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 0	$ 500

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB
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