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Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 24, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | $ 184,195 |
After One, Within Five Years | 148,916 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 333,111 | $ 268,161
Commercial Paper [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 1,193 |
After One, Within Five Years | 0 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 1,193 |
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 37,749 |
After One, Within Five Years | 58,153 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 95,902 |
Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 61,245 |
After One, Within Five Years | 90,062 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 151,307 |
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 3,988 |
After One, Within Five Years | 701 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 4,689 |
US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 28,961 |
After One, Within Five Years | 0 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | 28,961 |
Non-US [Member] | Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 51,059 |
After One, Within Five Years | 0 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total short-term investments | $ 51,059 |

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