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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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- Definition 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. + References No definition available. + Details
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