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Fair Value of Financial Instruments (Financial Instruments Carried at Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 26, 2017
Jun. 26, 2016
Assets, Fair Value Disclosure [Abstract]    
Short-term investments $ 474,783 $ 439,151
Other long-term investments 42,759 40,179
Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 3,522 713
Short-term investments 474,783 439,151
Other long-term investments 42,759 40,179
Total assets 521,064 480,043
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 3,522 576
Short-term investments 0 0
Other long-term investments 0 0
Total assets 3,522 576
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 0 137
Short-term investments 474,783 439,151
Other long-term investments 42,759 40,179
Total assets 517,542 479,467
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 183,548 190,440
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 183,548 190,440
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 183,548 190,440
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 169,569 168,767
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 169,569 168,767
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 169,569 168,767
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 42,759 40,179
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 42,759 40,179
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 678 3,317
Commercial Paper [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 678 3,317
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 0 0
US Government Agencies Debt Securities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 0 0
US Government Agencies Debt Securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 0 0
US Government Agencies Debt Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 0 0
Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 0 137
Certificates of Deposit [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 0 0
Certificates of Deposit [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 0 137
Certificates of Deposit [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 3,522 576
Money Market Funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents 3,522 576
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
U.S. | Certificates of Deposit [Member]    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 11,087 3,500
U.S. | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 11,087 3,500
U.S. | Certificates of Deposit [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 0 0
U.S. | Certificates of Deposit [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 11,087 3,500
U.S. | 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]    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 109,901 73,127
Non-US [Member] | Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Short-term investments 109,901 73,127
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 109,901 73,127
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