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Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands | Dec. 27, 2015 | Jun. 28, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 524,258 | $ 572,160
Gross Unrealized Gains | 2,903 | 1,820
Gross Unrealized Losses | (594) | (499)
Estimated Fair Value | 526,567 | 573,481
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 192,388 | 194,123
Gross Unrealized Gains | 1,877 | 988
Gross Unrealized Losses | (134) | (341)
Estimated Fair Value | 194,131 | 194,770
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 162,889 | 152,831
Gross Unrealized Gains | 1,026 | 832
Gross Unrealized Losses | (460) | (158)
Estimated Fair Value | 163,455 | 153,505
U.S. | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 500 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 500 | 0
Non-US [Member] | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 168,481 | 225,206
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 168,481 | $ 225,206

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