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Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 26, 2017	Jun. 26, 2016
Schedule of Available-for-sale Securities [Line Items]
Document Period End Date	Mar. 26, 2017
Available-for-sale Securities, Debt Securities, Current	$ 474,783	$ 439,151
Amortized Cost	472,958	432,603
Gross Unrealized Gains	2,520	6,636
Gross Unrealized Losses	(695)	(88)
Estimated Fair Value	474,783	439,151
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities, Current	183,548
Amortized Cost	182,500	186,893
Gross Unrealized Gains	1,266	3,562
Gross Unrealized Losses	(218)	(15)
Estimated Fair Value	183,548	190,440
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities, Current	169,569
Amortized Cost	168,792	165,766
Gross Unrealized Gains	1,254	3,074
Gross Unrealized Losses	(477)	(73)
Estimated Fair Value	169,569	168,767
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities, Current	678
Amortized Cost	678	3,317
Estimated Fair Value	678	3,317
U.S. | Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities, Current	11,087
Amortized Cost	11,087	3,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	11,087	3,500
Non-US [Member] | Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities, Current	109,901
Amortized Cost	109,901	73,127
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 109,901	$ 73,127

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