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Fair Value of Financial Instruments (Financial Instruments Carried at Fair Value) (Details) - USD ($) | Mar. 25, 2018 | Jun. 25, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value transfers level 1 to level 2 | $ 0 |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 300,239,000 | $ 478,341,000
Other long-term investments | 60,419,000 | 50,366,000
Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 10,421,000 | 3,722,000
Short-term investments | 300,239,000 | 478,341,000
Other long-term investments | 60,419,000 | 50,366,000
Total assets | 371,079,000 | 532,429,000
Municipal Bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 109,388,000 | 180,041,000
Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 109,388,000 | 180,041,000
Corporate Bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 67,296,000 | 177,721,000
Corporate Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 67,296,000 | 177,721,000
US Government Agencies Debt Securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 3,893,000 | 0
US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 3,893,000 | 0
Common stock of non-U.S. corporations | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other long-term investments | 60,419,000 | 50,366,000
Commercial Paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 2,096,000 | 200,000
Commercial Paper | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 2,096,000 | 200,000
US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 7,368,000 | 0
Commercial Paper | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 999,000 |
Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 1,802,000
Money Market Funds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 2,054,000 | 1,184,000
Non-US | Certificates of Deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 117,566,000 | 120,379,000
Non-US | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 117,566,000 | 120,379,000
Non-US | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 736,000
Level 1 | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 3,054,000 | 1,184,000
Short-term investments | 3,893,000 | 0
Other long-term investments | 0 | 0
Total assets | 6,947,000 | 1,184,000
Level 1 | Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 0 | 0
Level 1 | Corporate Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 0 | 0
Level 1 | US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 3,893,000 | 0
Level 1 | Common stock of non-U.S. corporations | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other long-term investments | 0 | 0
Level 1 | Commercial Paper | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 0 | 0
Level 1 | US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 1,000,000 | 0
Level 1 | Commercial Paper | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 0
Level 1 | Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 0
Level 1 | Money Market Funds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 2,054,000 | 1,184,000
Level 1 | Non-US | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 0 | 0
Level 1 | Non-US | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 0
Level 2 | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 7,367,000 | 2,538,000
Short-term investments | 296,346,000 | 478,341,000
Other long-term investments | 60,419,000 | 50,366,000
Total assets | 364,132,000 | 531,245,000
Level 2 | Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 109,388,000 | 180,041,000
Level 2 | Corporate Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 67,296,000 | 177,721,000
Level 2 | US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 0 | 0
Level 2 | Common stock of non-U.S. corporations | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other long-term investments | 60,419,000 | 50,366,000
Level 2 | Commercial Paper | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 2,096,000 | 200,000
Level 2 | US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 6,368,000 | 0
Level 2 | Commercial Paper | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 999,000 | 0
Level 2 | Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 1,802,000
Level 2 | Money Market Funds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 0
Level 2 | Non-US | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 117,566,000 | 120,379,000
Level 2 | Non-US | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 736,000
Level 3 | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 0
Short-term investments | 0 | 0
Other long-term investments | 0 | 0
Total assets | 0 | 0
Level 3 | Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 0 | 0
Level 3 | Corporate Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 0 | 0
Level 3 | US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 0 | 0
Level 3 | Common stock of non-U.S. corporations | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other long-term investments | 0 | 0
Level 3 | Commercial Paper | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 0 | 0
Level 3 | US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 0
Level 3 | Commercial Paper | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 0
Level 3 | Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 0
Level 3 | Money Market Funds | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 | 0
Level 3 | Non-US | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term investments | 0 | 0
Level 3 | Non-US | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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