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Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands | Sep. 25, 2016 | Jun. 26, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | $ 461,207 | $ 439,151
Amortized Cost | 455,178 | 432,603
Gross Unrealized Gains | 6,122 | 6,636
Gross Unrealized Losses | (93) | (88)
Estimated Fair Value | 461,207 | 439,151
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 186,310 |
Amortized Cost | 183,585 | 186,893
Gross Unrealized Gains | 2,775 | 3,562
Gross Unrealized Losses | (50) | (15)
Estimated Fair Value | 186,310 | 190,440
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 169,201 |
Amortized Cost | 165,897 | 165,766
Gross Unrealized Gains | 3,347 | 3,074
Gross Unrealized Losses | (43) | (73)
Estimated Fair Value | 169,201 | 168,767
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,802 | 3,317
Estimated Fair Value | 3,802 | 3,317
U.S. | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 93,103 |
Amortized Cost | 8,791 | 3,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 8,791 | 3,500
Non-US [Member] | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 8,791 |
Amortized Cost | 93,103 | 73,127
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 93,103 | $ 73,127
Non-US [Member] | Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | $ 3,802 |

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