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Fair Value of Financial Instruments (Financial Instruments Carried at Fair Value) (Details) - USD ($)	3 Months Ended
	Sep. 24, 2017	Jun. 25, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Document Period End Date	Sep. 24, 2017
Fair value transfers level 1 to level 2	$ 0
Assets, Fair Value Disclosure [Abstract]
Short-term investments	472,796,000	$ 478,341,000
Other long-term investments	47,298,000	50,366,000
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	87,022,000	3,722,000
Short-term investments	472,796,000	478,341,000
Other long-term investments	47,298,000	50,366,000
Total assets	607,116,000	532,429,000
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	861,000	1,184,000
Short-term investments	0	0
Other long-term investments	0	0
Total assets	861,000	1,184,000
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	86,161,000	2,538,000
Short-term investments	472,796,000	478,341,000
Other long-term investments	47,298,000	50,366,000
Total assets	606,255,000	531,245,000
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0
Short-term investments	0	0
Other long-term investments	0	0
Total assets	0	0
Municipal Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	185,240,000	180,041,000
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	185,240,000	180,041,000
Municipal Bonds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Municipal Bonds [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	185,240,000	180,041,000
Municipal Bonds [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Corporate Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	172,967,000	177,721,000
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	172,967,000	177,721,000
Corporate Bonds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Corporate Bonds [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	172,967,000	177,721,000
Corporate Bonds [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Common stock of non-U.S. corporations [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Other long-term investments	47,298,000	50,366,000
Common stock of non-U.S. corporations [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Other long-term investments	0	0
Common stock of non-U.S. corporations [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Other long-term investments	47,298,000	50,366,000
Common stock of non-U.S. corporations [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Other long-term investments	0	0
Commercial Paper [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	2,080,000	200,000
Commercial Paper [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Commercial Paper [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	2,080,000	200,000
Commercial Paper [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	1,802,000
Municipal Bonds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0
Municipal Bonds [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	1,802,000
Municipal Bonds [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	861,000	1,184,000
Money Market Funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	861,000	1,184,000
Money Market Funds [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0
Money Market Funds [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0
Non-US [Member] | Certificates of Deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	112,509,000	120,379,000
Non-US [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	112,509,000	120,379,000
Non-US [Member] | Certificates of Deposit [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Non-US [Member] | Certificates of Deposit [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	112,509,000	120,379,000
Non-US [Member] | Certificates of Deposit [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Non-US [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	86,161,000	736,000
Non-US [Member] | Certificates of Deposit [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0
Non-US [Member] | Certificates of Deposit [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	86,161,000	736,000
Non-US [Member] | Certificates of Deposit [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	$ 0	$ 0

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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