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Fair Value of Financial Instruments (Financial Instruments Carried at Fair Value) (Details) - USD ($)	Dec. 24, 2017	Jun. 25, 2017
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	480,221,000	$ 478,341,000
Other long-term investments	72,517,000	50,366,000
Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	86,450,000	3,722,000
Short-term investments	480,221,000	478,341,000
Other long-term investments	72,517,000	50,366,000
Total assets	639,188,000	532,429,000
Municipal Bonds
Assets, Fair Value Disclosure [Abstract]
Short-term investments	178,775,000	180,041,000
Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	178,775,000	180,041,000
Corporate Bonds
Assets, Fair Value Disclosure [Abstract]
Short-term investments	172,810,000	177,721,000
Corporate Bonds | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	172,810,000	177,721,000
US Government Agencies Debt Securities
Assets, Fair Value Disclosure [Abstract]
Short-term investments	3,914,000	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	3,914,000	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	72,517,000	50,366,000
Commercial Paper
Assets, Fair Value Disclosure [Abstract]
Short-term investments	2,088,000	200,000
Commercial Paper | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	2,088,000	200,000
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	1,191,000	1,184,000
Non-US | Certificates of Deposit
Assets, Fair Value Disclosure [Abstract]
Short-term investments	122,634,000	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	122,634,000	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	85,259,000	736,000
Level 1 | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	1,191,000	1,184,000
Short-term investments	3,914,000	0
Other long-term investments	0	0
Total assets	5,105,000	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	3,914,000	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 | 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	1,191,000	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	85,259,000	2,538,000
Short-term investments	476,307,000	478,341,000
Other long-term investments	72,517,000	50,366,000
Total assets	634,083,000	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	178,775,000	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	172,810,000	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	72,517,000	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	2,088,000	200,000
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	122,634,000	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	85,259,000	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 | 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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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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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