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Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands | Mar. 25, 2018 | Jun. 25, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 302,325 | $ 474,460
Gross Unrealized Gains | 42 | 4,144
Gross Unrealized Losses | (2,128) | (263)
Estimated Fair Value | 300,239 | 478,341
Available-for-sale Securities, Debt Securities, Current | 300,239 | 478,341
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 110,504 | 177,890
Gross Unrealized Gains | 6 | 2,219
Gross Unrealized Losses | (1,122) | (68)
Estimated Fair Value | 109,388 | 180,041
Available-for-sale Securities, Debt Securities, Current | 109,388 |
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 68,238 | 175,991
Gross Unrealized Gains | 36 | 1,925
Gross Unrealized Losses | (978) | (195)
Estimated Fair Value | 67,296 | 177,721
Available-for-sale Securities, Debt Securities, Current | 67,296 |
US Government Agencies Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,921 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (28) | 0
Estimated Fair Value | 3,893 | 0
Available-for-sale Securities, Debt Securities, Current | 3,893 |
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,096 | 200
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 2,096 | 200
Available-for-sale Securities, Debt Securities, Current | 2,096 |
Non-US [Member] | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 117,566 | 120,379
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 117,566 | $ 120,379
Available-for-sale Securities, Debt Securities, Current | $ 117,566 |

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