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Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands | Sep. 23, 2018 | Jun. 24, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 331,637 | $ 270,235
Gross Unrealized Gains | 37 | 53
Gross Unrealized Losses | (2,451) | (2,127)
Estimated Fair Value | 329,223 | 268,161
Debt Securities, Available-for-sale, Current | 329,223 | 268,161
Variable Rate Demand Obligation [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 400 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 400 | 0
Debt Securities, Available-for-sale, Current | 400 |
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 104,136 | 110,198
Gross Unrealized Gains | 2 | 17
Gross Unrealized Losses | (1,222) | (939)
Estimated Fair Value | 102,916 | 109,276
Debt Securities, Available-for-sale, Current | 102,916 |
Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 146,526 | 77,871
Gross Unrealized Gains | 35 | 36
Gross Unrealized Losses | (1,159) | (1,150)
Estimated Fair Value | 145,402 | 76,757
Debt Securities, Available-for-sale, Current | 145,402 |
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,667 | 3,922
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (10) | (38)
Estimated Fair Value | 4,657 | 3,884
Debt Securities, Available-for-sale, Current | 4,657 |
US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 44,294 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (60) | 0
Estimated Fair Value | 44,234 | 0
Debt Securities, Available-for-sale, Current | 44,234 |
Commercial Paper [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,978 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1,978 | 0
Debt Securities, Available-for-sale, Current | 1,978 |
Non-US [Member] | Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 29,136 | 77,744
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 29,136 | 77,744
Debt Securities, Available-for-sale, Current | 29,136 |
UNITED STATES | Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 500 | 500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 500 | $ 500
Debt Securities, Available-for-sale, Current | $ 500 |

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