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Investments (Summary of Marketable Investments by Type) (Details) - USD ($) $ in Thousands | Jun. 28, 2015 | Jun. 29, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 572,160 | $ 870,993
Gross Unrealized Gains | 1,820 | 4,775
Gross Unrealized Losses | (499) | (126)
Estimated Fair Value | 573,481 | 875,642
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 194,123 | 291,869
Gross Unrealized Gains | 988 | 2,323
Gross Unrealized Losses | (341) | (12)
Estimated Fair Value | 194,770 | 294,180
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 152,831 | 200,177
Gross Unrealized Gains | 832 | 2,283
Gross Unrealized Losses | (158) | (114)
Estimated Fair Value | 153,505 | 202,346
U.S. agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 0 | 18,994
Gross Unrealized Gains | 0 | 141
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 0 | 19,135
Non-U.S. certificates of deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 225,206 | 352,928
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 225,206 | 352,928
Non-U.S. government securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 0 | 7,025
Gross Unrealized Gains | 0 | 28
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 0 | $ 7,053

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