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Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands | Dec. 25, 2016 | Jun. 26, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | $ 454,021 | $ 439,151
Amortized Cost | 454,144 | 432,603
Gross Unrealized Gains | 1,457 | 6,636
Gross Unrealized Losses | (1,580) | (88)
Estimated Fair Value | 454,021 | 439,151
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 186,031 |
Amortized Cost | 186,214 | 186,893
Gross Unrealized Gains | 583 | 3,562
Gross Unrealized Losses | (767) | (15)
Estimated Fair Value | 186,030 | 190,440
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 165,077 |
Amortized Cost | 165,016 | 165,766
Gross Unrealized Gains | 874 | 3,074
Gross Unrealized Losses | (813) | (73)
Estimated Fair Value | 165,077 | 168,767
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,863 | 3,317
Estimated Fair Value | 3,863 | 3,317
U.S. | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 89,901 |
Amortized Cost | 9,150 | 3,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 9,150 | 3,500
Non-US [Member] | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 9,150 |
Amortized Cost | 89,901 | 73,127
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 89,901 | $ 73,127
Non-US [Member] | Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | $ 3,862 |

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