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Fair Value of Financial Instruments (Financial Instruments Carried at Fair Value) (Details) - USD ($) $ in Thousands	Sep. 23, 2018	Jun. 24, 2018
Assets, Fair Value Disclosure [Abstract]
Short-term investments	$ 329,223	$ 268,161
Other long-term investments	50,240	57,501
Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	153,009	77,766
Short-term investments	329,223	268,161
Other long-term investments	50,240	57,501
Total assets	532,472	403,428
Variable Rate Demand Obligation [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	400	0
Variable Rate Demand Obligation [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	400	0
US Treasury Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	44,234	0
US Treasury Securities [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	44,234	0
Municipal Bonds
Assets, Fair Value Disclosure [Abstract]
Short-term investments	102,916	109,276
Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	102,916	109,276
Corporate Bonds
Assets, Fair Value Disclosure [Abstract]
Short-term investments	145,402	76,757
Corporate Bonds | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	145,402	76,757
US Government Agencies Debt Securities
Assets, Fair Value Disclosure [Abstract]
Short-term investments	4,657	3,884
US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	4,657	3,884
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	50,240	57,501
Commercial Paper
Assets, Fair Value Disclosure [Abstract]
Short-term investments	1,978	0
Commercial Paper | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	1,978	0
Corporate Bond Securities [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	2,499	0
US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	1,500	275
Commercial Paper | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	2,000
Money Market Funds | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	10,157	1,992
Non-US | Certificates of Deposit
Assets, Fair Value Disclosure [Abstract]
Short-term investments	29,136	77,744
Non-US | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	29,136	77,744
Non-US | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	136,853	75,499
UNITED STATES | Certificates of Deposit
Assets, Fair Value Disclosure [Abstract]
Short-term investments	500	500
UNITED STATES | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	500	500
Level 1 | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	10,157	1,992
Short-term investments	44,234	3,884
Other long-term investments	0	0
Total assets	54,391	5,876
Level 1 | Variable Rate Demand Obligation [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Level 1 | US Treasury Securities [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	44,234	0
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	0	3,884
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 | Corporate Bond Securities [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	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	0	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 | Money Market Funds | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	10,157	1,992
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 1 | UNITED STATES | 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 2 | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	142,852	75,774
Short-term investments	284,989	264,277
Other long-term investments	50,240	57,501
Total assets	478,081	397,552
Level 2 | Variable Rate Demand Obligation [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	400	0
Level 2 | US Treasury Securities [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Level 2 | Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	102,916	109,276
Level 2 | Corporate Bonds | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	145,402	76,757
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	4,657	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	50,240	57,501
Level 2 | Commercial Paper | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	1,978	0
Level 2 | Corporate Bond Securities [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	2,499	0
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	1,500	0
Level 2 | Commercial Paper | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	2,000	275
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	29,136	77,744
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	136,853	75,499
Level 2 | UNITED STATES | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	500	500
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 | Variable Rate Demand Obligation [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0
Level 3 | US Treasury Securities [Member] | 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]
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 | Corporate Bond Securities [Member] | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	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 | 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
Level 3 | UNITED STATES | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis
Assets, Fair Value Disclosure [Abstract]
Short-term investments	$ 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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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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