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Investments (Summary of Marketable Investments by Type) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 29, 2013 | Jun. 30, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 899,321 | $ 834,249
Gross Unrealized Gains | 3,197 | 2,695
Gross Unrealized Losses | (1,553) | (3,098)
Estimated Fair Value | 900,965 | 833,846
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 272,382 | 250,206
Gross Unrealized Gains | 1,255 | 817
Gross Unrealized Losses | (502) | (1,314)
Estimated Fair Value | 273,135 | 249,709
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 207,130 | 192,147
Gross Unrealized Gains | 1,704 | 1,678
Gross Unrealized Losses | (1,049) | (1,765)
Estimated Fair Value | 207,785 | 192,060
U.S. Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 31,222 | 39,288
Gross Unrealized Gains | 226 | 186
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 31,448 | 39,474
Non-U.S. Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 380,000 | 345,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 380,000 | 345,000
Non-U.S. Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,587 | 7,608
Gross Unrealized Gains | 12 | 14
Gross Unrealized Losses | (2) | (19)
Estimated Fair Value | $ 8,597 | $ 7,603

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