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Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($) $ in Thousands | Sep. 23, 2018 | Jun. 24, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | $ 159,462 |
After One, Within Five Years | 169,361 |
After Five, Within Ten Years | 0 |
After Ten Years | 400 |
Total short-term investments | 329,223 | $ 268,161
Variable Rate Demand Obligation [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 0 |
After One, Within Five Years | 0 |
After Five, Within Ten Years | 0 |
After Ten Years | 400 |
Total short-term investments | 400 |
Commercial Paper [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 1,978 |
After One, Within Five Years | 0 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 1,978 |
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 23,117 |
After One, Within Five Years | 79,799 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 102,916 |
Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 61,168 |
After One, Within Five Years | 84,234 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 145,402 |
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 3,963 |
After One, Within Five Years | 694 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 4,657 |
US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 40,351 |
After One, Within Five Years | 3,883 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 44,234 |
Non-US [Member] | Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 28,385 |
After One, Within Five Years | 751 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 29,136 |
UNITED STATES | Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 500 |
After One, Within Five Years | 0 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | $ 500 |

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