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Investments (Summary of Short-term Investments by Type) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 28, 2014 | Jun. 29, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 904,744 | $ 870,993
Gross Unrealized Gains | 4,242 | 4,775
Gross Unrealized Losses | (443) | (126)
Estimated Fair Value | 908,543 | 875,642
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 295,437 | 291,869
Gross Unrealized Gains | 2,405 | 2,323
Gross Unrealized Losses | (24) | (12)
Estimated Fair Value | 297,818 | 294,180
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 214,055 | 200,177
Gross Unrealized Gains | 1,690 | 2,283
Gross Unrealized Losses | (419) | (114)
Estimated Fair Value | 215,326 | 202,346
U.S. Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 18,950 | 18,994
Gross Unrealized Gains | 129 | 141
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 19,079 | 19,135
Non-U.S. Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 373,303 | 352,928
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 373,303 | 352,928
Non-U.S. Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,999 | 7,025
Gross Unrealized Gains | 18 | 28
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 3,017 | $ 7,053

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