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Fair Value of Financial Instruments (Financial Instruments Carried at Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jun. 24, 2018
Assets, Fair Value Disclosure [Abstract]    
Short-term investments $ 333,111 $ 268,161
Other long-term investments 44,122 57,501
Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 169,177 77,766
Short-term investments 333,111 268,161
Other long-term investments 44,122 57,501
Total assets 546,410 403,428
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
US Treasury Securities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 28,961 0
US Treasury Securities [Member] | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 28,961 0
Municipal Bonds    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 95,902 109,276
Municipal Bonds | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 95,902 109,276
Corporate Bonds    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 151,307 76,757
Corporate Bonds | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 151,307 76,757
US Government Agencies Debt Securities    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 4,689 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 4,689 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 44,122 57,501
Commercial Paper    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 1,193 0
Commercial Paper | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 1,193 0
Agency Securities [Member] | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 1,800 0
Corporate Bond Securities [Member] | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 4,452 0
US Government Agencies Debt Securities | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 2,998  
Commercial Paper | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 4,742 275
Money Market Funds | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 7,414 1,992
Non-US | Certificates of Deposit    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 51,059 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 51,059 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 147,771 75,499
UNITED STATES | Certificates of Deposit    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 0 500
UNITED STATES | Certificates of Deposit | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 0 500
Level 1 | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 10,412 1,992
Short-term investments 28,961 3,884
Other long-term investments 0 0
Total assets 39,373 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 28,961 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 | Agency Securities [Member] | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 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 2,998 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 7,414 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 158,765 75,774
Short-term investments 304,150 264,277
Other long-term investments 44,122 57,501
Total assets 507,037 397,552
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 0 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 95,902 109,276
Level 2 | Corporate Bonds | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 151,307 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 4,689 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 44,122 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 1,193 0
Level 2 | Agency Securities [Member] | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 1,800 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 4,452 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 0 0
Level 2 | Commercial Paper | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 4,742 275
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 51,059 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 147,771 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 0 500
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 | Agency Securities [Member] | Fair value of assets and liabilities measured on a recurring basis    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 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