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Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 24, 2017 | Jun. 25, 2017
Schedule of Available-for-sale Securities [Line Items] |  |
Document Period End Date | Sep. 24, 2017 |
Available-for-sale Securities, Debt Securities, Current | $ 472,796 | $ 478,341
Amortized Cost | 468,954 | 474,460
Gross Unrealized Gains | 4,108 | 4,144
Gross Unrealized Losses | (266) | (263)
Estimated Fair Value | 472,796 | 478,341
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 185,240 |
Amortized Cost | 183,070 | 177,890
Gross Unrealized Gains | 2,247 | 2,219
Gross Unrealized Losses | (77) | (68)
Estimated Fair Value | 185,240 | 180,041
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 172,967 |
Amortized Cost | 171,326 | 175,991
Gross Unrealized Gains | 1,830 | 1,925
Gross Unrealized Losses | (189) | (195)
Estimated Fair Value | 172,967 | 177,721
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 2,080 |
Amortized Cost | 2,080 | 200
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 2,080 | 200
Non-US [Member] | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 112,509 |
Amortized Cost | 112,478 | 120,379
Gross Unrealized Gains | 31 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 112,509 | 120,379
Non-US [Member] | Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | $ 0

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